Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a91474c0bb20071…

MALICIOUS

PDF

77.4 KB Created: 2021-07-04 16:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 320b0dfdae2381a02e83dd08d440a980 SHA-1: 92b218600aadf7ae3b1a9965e446a53f5821c2b9 SHA-256: 5a91474c0bb20071a3e22424ef7c83a13a6f79c85a863bf39282a7ff94495536
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing lure. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The primary attack pattern involves social engineering through a fake notification to elicit a phone call.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=linear+integrated+circuits+book+pdf PDF link annotation
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7c0b085946accebb83a037d90de5bd92/83829056217.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/58998633881.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b357828e542---furof.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/dufaneviwafadibetewitow.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/vukudeduzepoletepe.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/rufusiwedixekanubuxamox.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/k5t1j127bh0rqecof2pdt8uv06/46318947536.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e3f29e04b---85522959273.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9684f2a06---boletedafisatu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d286a2d927f---82907752889.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608693ef8870b---netejovasigepasil.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afc3573e3c---75881113445.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/botuwodajitixu.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/47725747322.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/luzoforebutid.pdfIn PDF document text
    • http://qca.ch/userfiles/file/jimibexe.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b8741a52ac87d310fd809a04ef52c538/35338759592.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/napaxipuxiwekezot.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732dabb77da---64326532128.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/vagegezixasibunamupifij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55c47169a4---47831862912.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ace48a20a---nuxodubuvaduxenojikubo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/fcc05b0da64417f68e1ebbb7e4468767/zosapawuzosesivenax.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc1080e58d---netemizajaromu.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/71407791402.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb08c81d1a---gobenedivutabusorilos.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 11036 bytes
SHA-256: 59f3e2cce7416478c98c0425e9fac3820f63c6806579fa973b36eb852abe6aee
font_02_sfnt_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 16912 bytes
SHA-256: 622d72be49f829e7f4ed35417afbbe0f38911011aa3877615a88dd0b212e32d1

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