Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c940d52d1cd3e12…

MALICIOUS

PDF

98.7 KB Created: 2021-06-27 20:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e2b8bc6f4debd3895629106b107eea97 SHA-1: 6c6a24a4455282b1c5628bdf1989754a9fb8872f SHA-256: 4c940d52d1cd3e127cb20ad83581b78a065ea91949945e17a31afd9bab10793c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting it's part of a link farm or phishing campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document may be designed to trick users into calling a fraudulent support number, a common tactic in tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.
  • 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) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://irlanc.ru/uplcv?utm_term=managing+the+public+sector+grover+starling+pdf PDF link annotation
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083f87841d97---subopatomovasux.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6323eea4da8cdebc18f184e2941b952e/nixenobi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c6828d172b2---35984717389.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e152215a89f68c80edc7509ea344f0d8/gisona.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/6900bf202be63f15e8135d275733d7ee/nujujobapesarokadubuz.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/82af492fdb7132c0c9e26078bf61170f/81432538064.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086948d0da1c---dodobo.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/xesiwaze.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/wurupagure.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16088495421c05---gotositagubajinavikowur.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/68563875108.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955875e6c9a---peladukadabakapa.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d30b5a69f72a927d25af669defae50e3/rawivakejufimez.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/41814077780.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210623025359.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/38841399274.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/69872129988.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19e441195---18849833445.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/88919841494.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/qu35vm26349noau7jeiumma2td/surufegutev.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160854f6ad63ac---62763961908.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c67c2af78e---gabexibowisinadobixi.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/08ff6894838c05486da8fd4fa51a518d/37709388661.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D7 11196 bytes
SHA-256: 76353e3184bb2ab27d4bc2eae4825b331f3e08f95fa91777f0e8d91c9e0b2668
font_02_sfnt_off00014e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8A 17248 bytes
SHA-256: 527499531bcfbd483a2af2dab73999d8518cce2159b393058fd79f1811ee0fe6

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