Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7e16a70ff9c025…

MALICIOUS

PDF

87.2 KB Created: 2021-09-03 23:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c53c5d26d7f9843955b6612330b9571f SHA-1: e48861bcc913149ae42725659acd91ef30e55c65 SHA-256: 7b7e16a70ff9c0254b00d246dafec4a5544ac59b6706eaaaabe4dc60c2f42624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://nomylo.ru/uplcv?utm_term=an+introduction+to+statistical+learning+with+applications+in+r+pdf%E4%B8%8B%E8%BD%BD PDF link annotation
    • http://kup-vino.cz/web/ckfinder/userfiles/files/58688404147.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/31295286352.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef0b7704a4---zizejuzunux.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/88338545417.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/86b44b6befbab76e64ce46bd91b0520c/joxoxaxakatosuziz.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/7f0b3c0563b8f1637fc76114a8a880c2/gawilijemum.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/uav49o2th1srun8vh071hcuji4/13254242650.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/45a29c3ac4fdee17165186658d4d0a9a/dowodabunidakag.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/7974166757.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/soxivin.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/nelunozud.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210730215418680463by5t4o.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093d44737c92---30274499911.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/48b6161a1319dc2c84331fd9a68e460b/xevakirisa.pdfIn PDF document text
    • http://come2menorca.com/images/file/22320547299.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/kutokazekaliwirevivonotas.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f8c383c9c5a---54421395583.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/01r1n5fv007a4b7fb01qvfifl7/puzepujek.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/24044383841.pdfIn PDF document text
    • http://azizolace.cz/images/file/dibivokulafimabopen.pdfIn PDF document text
    • http://starsunited.at/upload/files/4433443461.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b29816aa0d4---71708374593.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/3ck9d5i448u5ghj5updde7b2k6/61602691437.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/medowazoxenux.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 18192 bytes
SHA-256: f7be6045ff919c1ef4d49ec1e067490b1c565698b7b687602c117307f921ba01
font_01_sfnt_off00011085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001289c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289C 11068 bytes
SHA-256: 63a88d12469552ecc029ccbfacbcb0f8ac2a7723b1844c7f9999d6d4882ef38e
font_03_sfnt_off0001422f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422F 1948 bytes
SHA-256: b033f7fcbcd390b2cb396fbb5f03ef01f7ca9afc151f9d9df21604321f961cfa

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