Malicious PDF — malware analysis report

Static analysis result for SHA-256 5879a1509afad27b…

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 09:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 792a3c4a84501c26a187725ddf18d1ad SHA-1: 4491a6c0344615be139419c2e3611236fa1a6f58 SHA-256: 5879a1509afad27bbf9bde08fad2c61756baef37fe29f470e44b1eb9a407bfd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload storage, with numerous distinct hosts and disposable domains. The PDF document itself contains obfuscated content, but the presence of multiple links to potentially malicious sites suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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 http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a178b76b0f9---21897802629.pdf In PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67bc227bf0---vevovodevera.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c5785080---34201476935.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/47861607865.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1411d326---gunepozugonefele.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4aacc1887---81064970210.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/14abe8dbb0e78b7bf693b93c3de412ba/31476358230.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/4965c21391d31969de34c0385c446360/dofepeparujamipurivuso.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/6b72e5b567dd2f8b84564d7f3e731d73/sibazozemataf.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/0f44e0b56e4bcdb9f2e6549bf189a85f/vufamazexe.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/regako.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/7453104522.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dcdb1cabb---68976829695.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/31570935182.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/2356663933.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/9fc0309cecf935d40b0af1efb95b61db/74747555049.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/8j8jq6udlul1a9n30gm1os0053/24411161981.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/panulebexefex.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c42d13366bc---81700438021.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608764175ffce---sukowudez.pdfIn PDF document text
    • https://renault-service.com/userfiles/22163874504.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/50dad4b5944f0c864d2719f0833868f5/15770022182.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/mikoxarawavodelowevusum.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091f092cbe68---27020002955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=prioritize+your+time+meaningPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 16692 bytes
SHA-256: 767fc439adb1d057dbf1230d62d3f774787b1a562dd3e462eb65448d63c027ae
font_01_sfnt_off00011cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13510 10512 bytes
SHA-256: 4ef5962f30965c47241512229ec2ec64966cd146b6d43d50483eb132c2b5385b

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