Malicious PDF — malware analysis report

Static analysis result for SHA-256 82afc1d8a281e7c1…

MALICIOUS

PDF

78.7 KB Created: 2021-06-11 04:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 74dbab69dd50a91c0ab8e6120090a457 SHA-1: ed72c82399ab12a8081e3a69e45e0471b5692c12 SHA-256: 82afc1d8a281e7c1980d46c030fbc81e2973d817c9034392dec3d3456dc6f949
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a phishing or malware delivery mechanism, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=pokemon+season+1+full+episodes PDF link annotation
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbac1f9722d---36018128501.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/wadidonag.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/548963536.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e4753e015---44007636544.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/logosa.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af893401371---boviromekux.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a86ae0ef8---matixuket.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/77570cadf8300fc78509999e9b258c5c/60870285072.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/zorikagexefajefa.pdfIn PDF document text
    • http://hydrem.ru/images/file/44297838014.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/dbc79f64074a9d2116fa037de8060c1c/vutuxopo.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/6f5338efecb78f9b08ad06c21f49608a/lovinadunawinokamage.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5ffbb141939e6eaeb876fd587cbcc640/39990123720.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cc871165dba1cb6f9d847f629e43c89/62479560444.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/43d2c1cdbc7efe5c155714d2ef7d4a1a/bibuwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 5008 bytes
SHA-256: b70678392e3a1abfc46219904198fe6d24c3e4d950057ff88135d2a15f24e72a
font_01_sfnt_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 11924 bytes
SHA-256: a0604f5ae3d355b3b4a3c32277a6e7573783a737d868ccb4ec75d7a1a00712ba
font_02_sfnt_off00011e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2