Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d02ebc517968c7f…

MALICIOUS

PDF

88.9 KB Created: 2021-07-16 09:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bd95590f055a6e855abefa8a5133144e SHA-1: 9acc265f72b0ae7a0ff64a9a380d2c18aee64e7f SHA-256: 0d02ebc517968c7febde681fe8eec9d8e898dd1a0c72feeb0f8976a0a9625792
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress upload directories. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these links. The primary attack pattern involves luring users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6f801c138---jugirokigirojuzelaluvelom.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160753189845f9---99106295609.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c77d5235381---zufajovodiweketuxiti.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b42e6630d---76148509958.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c56a92ee8f6---libol.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30608aa56b---69874515244.pdfIn PDF document text
    • http://mosjob.ru/images/file/kimanidakipem.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/40288770724.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/lupepopabuni.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/os7e2ettsqn5d539jtv78rde3d/tolajababas.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/74732147993.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/rogaxozovogolefawefiguwi.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e538e62a91---56047444834.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/85831000671.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160edb857c520e---bebumafilivatak.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f3e69199b02e4380f1c47a33abf82dc6/57942304830.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/7a3c2123a78443afcaaaf07330770b18/84488126698.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/xujozowixakurajitufumab.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/salodunedimi.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/rafaruxolukuremakovoju.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/vorunub.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/g9vr43vjj4lpj6621ebm6vs895/lifezonimuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sprint+retrospective+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_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 17452 bytes
SHA-256: 5a05f37c1665015fc8b9b0da6f6916500d0ec8898701cf5d292b259af191e712
font_01_sfnt_off00012525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12525 10936 bytes
SHA-256: ab40c3a601c7caf2cf6646edc25482fe223960526c8bfc4729f623b93b5b6399
font_02_sfnt_off00013e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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