Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a2d4f3d7977a93…

MALICIOUS

PDF

71.9 KB Created: 2021-08-24 17:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3eeacbdeb4c90a687642cf5e547482d SHA-1: fce9601b949277d46e2d9d5406fa5e52a84820e6 SHA-256: 21a2d4f3d7977a937493db5e5cb58b118fb2a631307d302562df1aebc4839e81
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious or phishing sites. While no scripts were explicitly extracted, the nature of the URLs and the detection suggest it's designed to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9193

Heuristics 5

  • 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
  • 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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/84cb5e8d7f9444da5cca96a95fe4aaa5/20343471118.pdf In PDF document text
    • https://fullgame.hu/uploads/files/zowatemunavakatozupowufa.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/xigut.pdfIn PDF document text
    • http://findplusltd.com/file/zofipa.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/ramozam.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/wusozes.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/80458040244.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/p2pud40r3s1ldujt5t62d57mhs/nirudilaji.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c37204c4d5d---76032571878.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/p1bbhsgmlqb85ld2jg3vc7d28p/gafenez.pdfIn PDF document text
    • http://abnicum.com/files/file/42993811464.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/1a099427ee5149b1090b46b85b9e604c/94932614876.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/nuwimuvotomekuzad.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf481408837---3610111589.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/veturukovowej.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610793e58df40---watuweju.pdfIn PDF document text
    • http://indemo.pl/Image/files/roxezudekunivilej.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/m0dt5db7nu37ck5v37gqlaj02p/likazividuvobazi.pdfIn PDF document text
    • https://blv.by/upload/editor/files/silobagewusadoduriwa.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca0b121229---70373158181.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612443b02312b---fajejixotol.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160820f0504044---kizulubajukimekobip.pdfIn PDF document text
    • http://merwepizza.com/upload/file/bodapodekojojido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ielts+reading+book+8+test+3+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 11072 bytes
SHA-256: 0a53bfa34e3652643fb5587dac6273f9d5c9f1eff5ef37b4f592c901ed076c20