Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2aee4437af0a9d9…

MALICIOUS

PDF

76.2 KB Created: 2021-09-28 00:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef76ad94bf821b1952b23a496651198b SHA-1: 7d73d626f8187ca6674e8113bcc17ff8b8c21717 SHA-256: e2aee4437af0a9d90f611f62af0e06cbeb86692b0dca43ca45ce53bf40abb7f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The document body is unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://securitydm.eu/slicice/file/vazusagetoritowegimi.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1fe77a2d7---wikidu.pdf
    • http://dichvumucin.com/upload/ckupload/files/88260800086.pdf
    • http://thibangoto.com/app/webroot/uploads/files/45148413152.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2ee2082f5---26224085149.pdf
    • https://rajatotogroup3.com/contents/files/17030466697.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/qp6252p70hm079q5llsqncisj6/maxoxosopibudoxewin.pdf
    • https://vico-immobilien.com/ckfinder/userfiles/files/22520853615.pdf
    • https://taptigrihnirman.com/singhania/downloads/file/gagerixubigev.pdf
    • https://alkoplast.rs/files/70722713153.pdf
    • http://ahkkpcm.org/userfiles/79778321560.pdf
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/tazikoxabolowerojejar.pdf
    • http://cuanhuaabshanquoc.vn/files/93267494709.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349282b4495---sodeteveredexoxugeb.pdf
    • http://thepokewave.com/uploads/files/82837333197.pdf
    • http://mebelhotel.ru/userfiles/files/16994271684.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/pitiwefeg.pdf
    • http://lagostena.it/userfiles/files/kolepisukakukuxivivelam.pdf
    • http://adidravidar.com/ckfinder/userfiles/files/dekad.pdf
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/dezudalane.pdf
    • http://superfasttv.com/uploads/files/49180672489.pdf
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/vixixa.pdf
    • http://sntaviator.ru/ckfinder/userfiles/files/51160947930.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=claire+de+lune+debussy+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0ad.bin
55001a389608d0b32149c2176832ed43c1e0b6605607ac16506f23b50095a320
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AD 10660 bytes
font_01_sfnt_off0000d8ee.bin
5c6ee74853da973a6009207fafb3c72c0cc1b7a16bc343103d33f0f62ddad94a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 19748 bytes
font_02_sfnt_off00010b76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 16792 bytes