Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c935315e9f11f2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 07:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2958ea071cdf79c36ce2834858d0ffa SHA-1: 6946234bef3bc083c188b9d83ef5b846e2fe8ac0 SHA-256: 34c935315e9f11f2b19eee1c2e34ec207f2c4598c59d9338fa06dec5fb09b533
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with a phishing or malware delivery mechanism, often initiated via spearphishing attachments.

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 https://coretry.ru/uplcv?utm_term=spanish+nouns+that+start+with+w PDF link annotation
    • http://henzefashion.com/userfiles/file/wofuvanasamoniden.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/99325545971.pdfIn PDF document text
    • http://livilgirls.com/files/xawizomotekunod.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/xunizanewabositawen.pdfIn PDF document text
    • http://merwepizza.com/upload/file/woxofeviwosupupamixode.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/21764998994.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/19704335837.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/jetuzifujeniwiwoneja.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb2ba3d83---719190246.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/45d7d9c78ed163e6db77fa49fe15e69a/38558874309.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/81549934570.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/TuqDJHOe5ZRk.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/77851908334.pdfIn PDF document text
    • https://pokereshop.cz/data/file/34864114127.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/77349479289.pdfIn PDF document text
    • http://popmetre.com/news/files/masazomulokiserogoki.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/lamifabiligiweku.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/mujup.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e985d3b705---89373568732.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/58685481582.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/finozizosigaf.pdfIn PDF document text
    • https://megashina24.ru/files/files/22904591604.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/72853174253.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/57637978407.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_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 10432 bytes
SHA-256: e63df9e76d88d22f8a544909e4662a830b58077b68bda1ece2f6e50d8026c3bb
font_01_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 19484 bytes
SHA-256: fa7228342ef3b814e8bdb409478a3b46a093e204c0beccd4174e9dae33de63c7
font_02_sfnt_off0001261b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1