Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b4c5aab3851b36…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 07:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30cbad8ed47b11ace12e86b10b3f16b4 SHA-1: cc36420095ae7d4a64da88e2cc7fbccaa6683c10 SHA-256: 75b4c5aab3851b3651a44409f5ae784d85f1ac024f027dbd34269430c14b2c5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm suggests it's designed to lure users into downloading further malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffabe684a0a---votuxadozodoja.pdf In PDF document text
    • http://broorybulldogs.com/clients/33993/File/duxitup.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/85760178711.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/97166155883.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/20713550364.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/kitepu.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/wibejidefeferumotumaso.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071b19d1a94a---68027861765.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/20217205410.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/tutajusopitoxu.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/26581174250.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/sqbdielkeqhbfcsdgjpjrpqbb7/49920351811.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ef593606c---punazop.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ei992ls73bf64narpchn3954i9/40010804408.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/62351863878.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/67764629876.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/jakupovapizitevipefusob.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c5cc265c7---lugejitefawafetezuditonew.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/91368724868.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/xivenidepi.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8de6a290e20afe273baa574b7b1e24ac/51778799007.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098adb5d02aa---35300546889.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/60185103110.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/7lj78l7007ofgpd2golu6g2je1/xemizaruvebuwulore.pdfIn PDF document text
    • http://surausa.com/uploads/files/92528838715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=whole+word+method+of+teaching+reading+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_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 18420 bytes
SHA-256: 59c5ad50a4587cca891a4c0cae7dca1803b3c54c2c10dcf12bc16c9ff6b73f61
font_01_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AC 10976 bytes
SHA-256: f625093461ed5f8f4571d67d450667e79909ba57b7c99f97f60d1c39f1830953

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