Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55778aee9ab01a6…

MALICIOUS

PDF

116.8 KB Created: 2021-07-24 21:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 01dd623dc26ca5666c29520f5b262a2f SHA-1: d3763b530571ef585842767d8afa1564d00d0349 SHA-256: e55778aee9ab01a69ab4bdd78c93c65109deb12661deffeca22f5ce068c093ed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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) 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 http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/supepinofuxete.pdf In PDF document text
    • http://amexeuro.com/an3_Uploads/file/rapawasinefavapo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608257d80513c---90825388531.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6d94660d4fc841470ad00bdf2dac9bf6/biribis.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099be26ab83d---xuwovif.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/10336964706.pdfIn PDF document text
    • http://healthywithhart.com/res/file/43603855093.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16080d9d415e66---mizubodul.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/13212008898.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/fosujufugijisuvaxaxonavi.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/6aff8ec9b0f269051828b32edb9154cc/kupupodepigidufafal.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1de7ffd09e12c1c4929b918cdbba1d82/89032721380.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/1991c1e6570a494c11c6cba578274e67/kalixumadojox.pdfIn PDF document text
    • http://co-mit.com/uploads/files/vuzapogaketavimusuxuzolu.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/vaxasevetusomu.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f6592c2b9---2361083541.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/63529e21ce5a63477cb2f1ece1f1ebdb/7303795682.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/woravevokob.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/gekilofa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jifukapisibodo.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/79849944524.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/87029695382.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/84392525370.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/bc80b307ebec3802deac6eb439962a6d/vifijovilor.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/61u7i8qqo8uud1ttkfe1a8rmt0/refifodutexokewonivezajep.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/a457fa1532e8385ac6c79dea975ebf28/vizaxosibapafutus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=terraria+calamity+base+downloadPDF 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_off000163ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C01 10836 bytes
SHA-256: 8ab9f087514a269595995fff58848694cc3535a6bc40ae515a529f0119ddc590
font_02_sfnt_off0001950c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1950C 17840 bytes
SHA-256: 2640e68983b4bb7dc29287ae1b206fe1e251830924ad713e1d45f855af6d0e66

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