Malicious PDF — malware analysis report

Static analysis result for SHA-256 de071562b26146f6…

MALICIOUS

PDF

101.9 KB Created: 2021-08-16 15:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 797926ae957618ca969a370c36bb5899 SHA-1: 67a0df9483283cec2d421f943d33ffbe908eedc4 SHA-256: de071562b26146f6b4852949c6e7af29c77c89f7d57cb8373abdf0bbb4f6341f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm hosted on compromised WordPress sites and disposable domains. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=call+of+cthulhu+rpg+7th+edition+books', likely lead to phishing or malware distribution pages. The PDF structure and content suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://inwebjor.ru/uplcv?utm_term=call+of+cthulhu+rpg+7th+edition+books PDF link annotation
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ce8e110abc4f8e85ee97e3fc644c65f9/28489125419.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087e32bcecc9---88168514966.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081589b51200---matuvu.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/xefivuxawisozijowenararur.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1abf3888c---57160339076.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/xaviriboramunolixunam.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/kuteni.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080f24a8b099---likaxabakamalujevo.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/65809890467.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/12771d51431d20e20865c541243e4390/taleda.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/laloxidivurobomimozi.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/30727114714.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/xezogidirijedekurujo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160977261ed477---winavev.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b258c347ea1---gotavamire.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9617452a17d71a285cc9189fbf4d0722/16100957681.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acae82d2c5---1487968030.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4e1682dd9ee654d72d8dc525ff3f1abe/45649530688.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3516c6d535---60346918756.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/552be198ac4e9535ced85f8b416924c3/15623953795.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/31346343295.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/44582978036.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/zekefamawis.pdfIn PDF document text
    • https://ikansambel.com/contents//files/84335138323.pdfIn PDF document text
    • 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_off00012939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14150 11312 bytes
SHA-256: dce13b29c7a7a803977fb463b689192b0602b813955e245fb7ec86bd150e2654
font_02_sfnt_off00015b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B83 17636 bytes
SHA-256: c1c9cf3526fb2c97d70f68fe393b5eaefbf65c11b896afa8caf8172a88097efc

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