Malicious PDF — malware analysis report

Static analysis result for SHA-256 337339d0ebf94995…

MALICIOUS

PDF

87.1 KB Created: 2021-09-16 00:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ebe02ae70f51f2d7c9a46e6c056d53d SHA-1: ff7414432aa0ca6619c9b16d280812af4e78975c SHA-256: 337339d0ebf94995b8d364b1530cd5e396b0e84ba33410ca00a1718efc1dc70e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for SEO poisoning or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://rrr71.ru/upload_picture/ditibapotupifozulapeleso.pdf In PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/50666360611.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/wariviwaxofixita.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16569402912.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/82882256843.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210911105412.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/robuxikepitakopigodibidol.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/3994905172.pdfIn PDF document text
    • http://rs-entp.com/upload/file/83248575295.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/fowasodofel.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc548bef5f---ridufixamanuxisodego.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/jizekikotopuwepaborixa.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/xidapi.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/59810815222.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/ranonimepegit.pdfIn PDF document text
    • http://techmechengineers.com/uploads/jefab.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/96025111277.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ac25678d8cef2146e87ad86a719c3f3b/tadodafudiboganamewode.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd3422a808---59919084026.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132a33829cb0---62890030464.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161310bb148f1d---37595954575.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac3c4604f9---99522088586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hack+candy+crush+saga+2020+androidPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 17668 bytes
SHA-256: d0b05f2f6aae323cdb63a6d27924b3d8533567f014ee86e0ba4ceac834f73914
font_01_sfnt_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 17128 bytes
SHA-256: 62560a6161481e17e2d03ce8a55598cbaf2bc541b85272c4b8b74a09b5c6ecf2
font_02_sfnt_off00011d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4F 10912 bytes
SHA-256: 5ee0100822385251dad74fa0721aa9e168c1c38efcc8da7430b67af57f34fa5d
font_03_sfnt_off00013657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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