Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12ab2c35391e9fc…

MALICIOUS

PDF

75.2 KB Created: 2021-09-08 08:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37989ef8b04d62b4a193ccd687be1a91 SHA-1: 27f81194ea34ceee8ee4922bc7c43c122f37bd0a SHA-256: d12ab2c35391e9fcfbcfce2e996666851909c2a2f94a8200dbf2c1a9c008c826
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised WordPress sites and disposable domains. These links are likely intended to manipulate search engine rankings or serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://erdivigado.hu/userkepek/file/kifoleraximekimumozogo.pdf In PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/1rr4230ajcq7qsko7mrv1rcji7/palefososakadazopikav.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa9918e92a---20505602442.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/478d3861a20633c5b472352e30a64cc9/73345922794.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/1883982f1ab4877c08148e0cddbf4117/63191469051.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-25/20210825045223127397.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44523241df---18084866917.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95db7a2eca---27344155718.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070cf6a715ff---firimanedinaxunukabu.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/sogama.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/37677880115.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/nigapikovaketekomekaf.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/21272263321.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/sonimavarapupotimomimox.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b14dd385a1a---momerowan.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/95253685607.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/88879972484.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8889532c60---84880574780.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/51c9c1c401114cfb7b3cb08992342350/zitofakosibizi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16105e6a566b8d---dazozafipapumotu.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/74521070558.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/61d68b4a7898ebaec99ea428e98cc8c6/22687423569.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ao8m2t7ajf1vea3cic5ef97nb2/67502227134.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609f017078b08---kapajotibipone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hypertension+guidelines+2018+esc+pdfPDF 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_off0000beb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB9 17480 bytes
SHA-256: 37391a4e2eb364b19a192270e435a31fe5f335e96d060452a91db2c9a67c54a9
font_01_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 11340 bytes
SHA-256: 4e0f477de75c41d0a19be4d5e1176481a8c2ddbf739b6979f31a10096ce5a3b5
font_02_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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