Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3d71583083e8f0…

MALICIOUS

PDF

105.5 KB Created: 2021-08-19 11:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bcc3f5e76dd9a512d116f2a154aed9fe SHA-1: e3de45a1d1658e3a1a33178c059c5f8b745a1910 SHA-256: df3d71583083e8f0e0cd2c0f9d7da15c0f86aec622a7c23650dd7866d713eaee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, some pointing to compromised CMS uploads and link farms, suggests it is designed to redirect users to malicious sites or download further payloads. The document body is unreadable, but the heuristics and URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=ejercicios+de+binomio+al+cuadrado+perfecto+resueltos PDF link annotation
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/cnt41akcor40ek8drbfhr47kbq/laloxalojolabavuluko.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/31f8b82c7886a280c72f58c160a89d9d/4943402125.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/kaxina.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/1ca997352760acb382b1f1c3844de23f/27234870776.pdfIn PDF document text
    • http://meta-min.com/files/fubomuvoziga.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/fogomozil.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/6a5409302b13450f2663667474d30331/walunepofojagidajegoda.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ab845a4d034---viwokewosuboguxi.pdfIn PDF document text
    • https://numberonerevolution.it/file/xemedotomolabagoxuxow.pdfIn PDF document text
    • http://packturf.fr/files/28158050937.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/fekalipatak.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/qaer11ve179imu9sb9k9funcer/7612842784.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081a4a72f7f8---lojejaguworutupepubos.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/lixirinulafujul.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/ruvopesutaluk.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/kamobeto.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e053234a608---59343921896.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/vufowilut.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/05dd319cf783c364b3aeca16d30aecd1/15109476439.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/98411506340.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5d8157f0---noroxotexulasuxajel.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/bpqvaos51st2g7m24nh60k9agb/16911299991.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/bexopimupepupimozipofina.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/ziruzawokuwefikemisigeso.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_off00011e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E51 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off00013382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13382 18644 bytes
SHA-256: 27573fb42772010bd17b2f4f1e206b2ec60b86e9fa63b5ed4492a2c933334c29
font_02_sfnt_off000163d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D5 11136 bytes
SHA-256: bd26a5cea834da1dba42e425f9506e5b8e566108c75c7e01e8f1553415cb3bb4
font_03_sfnt_off00017d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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