Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c32cceaa67dd4ef…

MALICIOUS

PDF

102.6 KB Created: 2021-07-22 15:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e67f3a777c276c493d57036fe4fd243b SHA-1: 6bb1576dfb0ba64d256f71323878e595f534cd6c SHA-256: 0c32cceaa67dd4ef315cce82852e7f9f4e6429fdbfd31bb6c5a35ade4a90e8d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7b6d7ce97---nosolinilenonovexun.pdf In PDF document text
    • https://computerzone.pk/file/favolewomudogajubul.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f27dca1d5c---lajojipi.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ba42292882b6d5d59de09b4866d6727c/rowigomexupam.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/3568311023.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/fulujesubuwox.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/99450989865.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/13398944034.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40556bbe3c---naxodaxupixep.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6414bab12---1310697264.pdfIn PDF document text
    • http://diencohoanghuy.com/media/ftp/file/fotamimelijibegad.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/pc5mk80fqatm75ldlotc6k50o5/bumilakiwofosevafosafilo.pdfIn PDF document text
    • http://df-foundry.net/d/files/13735509275.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/fojazunubugopakomowun.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92fabf0cca---53368812111.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/tlqt78dtsiga3pqfm8uedoj2ld/tobepeniwug.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/dipurazatumigelivaji.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ec274802349bc71b8cf13ea7d53789c1/divoderexalizodajituzeta.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/tipurudasozugukelat.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/58959505510.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/365adb8efafd77ea635b2f2d1c90b3cc/36044546642.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/uqdd0u29csasl6hf1nvefu3055/leposilulagafilopiwatomax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=once+upon+a+time+in+china+5+full+moviePDF 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_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000142c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C9 17588 bytes
SHA-256: c75ac8e781d5b660cff4041427ded4408eeae3c7341193b68bc48942356243b5
font_02_sfnt_off000170f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170F1 10804 bytes
SHA-256: e722d3d209f95c44dbee59b4e9284d5a7b784ad128073ad1a26f0a8dfb54c8a5

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