Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c151e7e4798956…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 14:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af8c446b70d1eb0472ba30d607be3dc2 SHA-1: cb944ba5325db9a476465e32392af49fbef051f1 SHA-256: 12c151e7e47989560f2f078f7adaa6bbda9d9698646244a8e25fda27cbef2982
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO poisoning tactic. The embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://merlegdoktor.hu/tmp/ponivisofopabizizuf.pdf In PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/sikukatatotowili.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59d9d4a22e---lifafopolulatu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d65430e4---visipadawoverirepuveroz.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501033756920486.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/54086198063.pdfIn PDF document text
    • http://promador.pl/userfiles/file/kapiz.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/91859113117.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050312465373499.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef6bf7d6fc---didevekoxejiwasivax.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161042c94aaaba---duxifimid.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16108bc428141e---dixub.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/letifubanonigagukavajol.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/452120904e754448478233d3ee131ee0/wubaximoxesenirorutisafez.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/kijinejilarevefewemoximor.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/14955144889.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/sowaralole.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/55787143878.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/50640928487.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/jasonoteninafazumaf.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/lufiruzebag.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0adcd22fe---mafopum.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6rsbjcgdtb95am3eb48j2dmkd4/tozavujaremativi.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/tagamosurijotodam.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a8b5ae0ac63a040325bccdbd08f11f06/78888782524.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/12849364976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hacer+pdf+editable+gratisPDF 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_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 18424 bytes
SHA-256: f54395214318473ed013e8070499c0fa85af8ed3bb0dd62350c8a0fe7b061524
font_02_sfnt_off0001217c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217C 10704 bytes
SHA-256: 27cb0ef65ec50d3217f7bb1432a7827f5be5130640a0fa72b6a25eff83b7f9c7

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