Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e720233cbe5a88d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 22:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3be771e4a10a5bd9285438d54924d6a5 SHA-1: c67fa49cebf573cb2a53f99155d8866eca8b8b65 SHA-256: 3e720233cbe5a88d7124f9133b6076357f3e86313bfe634f1730778749ef9a5d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting users through these links. No scripts were extracted, but the structure itself is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=consumer+research+definition+pdf PDF link annotation
    • https://hoavily.com/uploads/files/degif.pdfIn PDF document text
    • https://themalc.org/files/file/gibirapemose.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/41a8713543ebd4fb0b800f83b123afd4/zemezunesezotelofufazufap.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cd810fcdd---vuxakevewezeresulapalipal.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/43825495605.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161218882e6721---96789412078.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/kaxebapedaratepelif.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/88a4550762a5d223854426c48aca5b77/xedufonunufumuk.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/28055949000.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/39119172849.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/pomejuwibeneperix.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/58682027927.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4af72ebb3---94146672108.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/limesetikidesiw.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210719181037_7td8b1.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab8b6a489---berokigixelan.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ddaca9df0b0d49c5061b80e5be6c1bd0/bodudusivisa.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/beweg.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/puwowozode.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940ac5087bf---fukenodamurotigepilul.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/18288475334.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/fapetusilowose.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/jafuvubovatox.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac405a2cf13---zewonarutuxidedi.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_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 17072 bytes
SHA-256: 2912045444f5eebc0bf108cb2c64c70794b7a0d1eb182ff14a6cd4e9f200be43
font_01_sfnt_off0001134b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134B 10972 bytes
SHA-256: 80d876bb90bf4456a1cc3010fb5359300d71841b862da4fed959c7c5e871b492
font_02_sfnt_off00012c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1