Malicious PDF — malware analysis report

Static analysis result for SHA-256 7899e0efb88af279…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 17:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9f3610b81bccc415d86d9594c056dd90 SHA-1: ae1132008a9a3f3f5b323214f917b6295e593172 SHA-256: 7899e0efb88af27980920214d87a8b479dbf22339b535d3da5fb8c9a9cb7aff8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated, but the presence of external URI heuristics and the ClamAV detection strongly indicate a malicious intent, likely to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://robalton.es/Albums/images/file///lupopisupe.pdf In PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ba68b688---rukalovosawer.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132c5b33492f---8349173405.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ca29f65066ff8b0da3e96960308b2cea/14815782180.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1449434448609f3ff9ce9cb.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7d0b148c36bb5867424a4839f19d321/tarexap.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/hrrlp10pkbi2ikp9d7np44bg75/25918900131.pdfIn PDF document text
    • https://samowar.me/userfiles/files/daganebokamevu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075746368885---lojabugipajuwusexakoluzoz.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/xixavojenagipomad.pdfIn PDF document text
    • http://llux.vn/uploads/files/zisigodajoj.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/97311130901.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/vosulowijexidewaxoxiwidal.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d02d62d96a---rajapoxekunuganeriveleze.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160753ae43d9fe---95863704793.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7735e7831---zodiregesuduv.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vesinux.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/wimujepezutewu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f29f207281c---gofunezima.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ic6oimm60d05b0m1s4vtrssrvi/97156321912.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/90739257598.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/vopvgi2ua55lpndtvlgfl6esno/dexalubazuzomu.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d13b6c4ae606866b11529b55bb7d833e/pewivibikukedomenupupo.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/pukidiworobulepivebejutot.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/52000934911.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1f3aaf80eab142013f24e08eb2fafa0/32184607363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=3m+patch+panel+48+port+pdfPDF link annotation
    • 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_off0000bbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB9 10988 bytes
SHA-256: f96e046d4cff9ec0751aba7525bd07116dcf5c1f4de9cf376e601974110d214e
font_01_sfnt_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 17872 bytes
SHA-256: ddf5e74349fa0acf1eb14a2cbd9e67d80a0628774730fe12d0855b9827778576

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