Malicious PDF — malware analysis report

Static analysis result for SHA-256 551b6ddfe2eef101…

MALICIOUS

PDF

111.1 KB Created: 2021-06-27 06:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 796d3dbcb9c5a44683dad643a22643fb SHA-1: 79c8b99bdc83b0997b06ba0c2c8d7cb897a1dbd6 SHA-256: 551b6ddfe2eef101342c3859c0096827e68cd930b6a716f3f17948c0eafcd22b
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or for SEO manipulation, rather than direct exploitation within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/70a6b3214692ef5b93f71aa6bde999f1/wademirivisugenaveka.pdf In PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160705d8fc184f---wadobomilumenefuzipi.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/14486740037.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/zuwag.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/56786958954.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/acnm9fjtu3ovibq68s01ooa7t4/22977784756.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/22731491309.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083f38179afa---rixifivifunoxizukixu.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/giberekumuxitajurizuwimo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea11aef545---nufubinovapax.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/68478443530.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/7393c9fd03eb10036cf345875e323f38/fobikiwanobedidut.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rtlglsqal6q71lcpm47f81d0r0/juvirimigip.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/jatodexedukobarupokudi.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/494fd3e0531cd445328e5d4c135ea6c0/kawatuje.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2807e81c7fa3379ee0782e5f180d2b97/gafulidavedofen.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720fb72d632---893352017.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/vebolasawisaraneta.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/rgvemmpmk0mnnsciifgklpgbha/55280544906.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/1704447615.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ba46dca5af25cb642891cd85d2d872f4/xuposudikaso.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2deb4ebba---17639181002.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160833c7e57352---domividasewuzebuvadilo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a181ec0d---bowawejojujogetonotew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ceh+v10+exam+questions+and+answersPDF 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_off00014a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8F 11172 bytes
SHA-256: ef0e6eced27f180e874bc804bbba9078fcbe341e32d76f2e870b1ace102a79f7
font_01_sfnt_off0001646e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1646E 18528 bytes
SHA-256: 36c728cb2b24f864f3bd52c65effb04ebc3eead312730e85735e93231dfb463d
font_02_sfnt_off00019578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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