Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e180e2a6bcfbb86…

MALICIOUS

PDF

94.1 KB Created: 2021-08-09 22:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b215f615cd573c21bbce79a2ba9cc1b SHA-1: f82aeb985a58e4d6f17139e03bbb186070fb3174 SHA-256: 4e180e2a6bcfbb862386d804720fd78723c11c8a6b44c7ef4976c0eb5fd779b5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites hosting further PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting an attempt to distribute malicious content or engage in phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pistant.ru/uplcv?utm_term=how+to+flash+bios+msi+b450+tomahawk PDF link annotation
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06728666b---98436049420.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/zexereri.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/gilesubid.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/vamuwekekobiz.pdfIn PDF document text
    • http://tencanpowder.com/d/files/befaferujefirewedexe.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/latezigemedatitadib.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/nunefizidi.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/34862059817.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3f8eb7fceade3fb42b77dd4163e85b8c/netoxetunuluvigo.pdfIn PDF document text
    • https://micsys.in/userfiles/file/73143166541.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160783de08770b---73176075447.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ab72ea6095f---zuzurizokujudaveg.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/857ae23fec7479d7295f0d5a4ade38ee/gelexajobex.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/11054161441.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091d559b9d08---sojuwuvusonifutovaki.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a15097b9b---wadak.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/fefelukemusutevewa.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a491d4f5a---zorojedepe.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/podifamupajokosowejemos.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6777417e1---56113590805.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e575b361d---25675701357.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/59102725022.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/7770093404.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/zuxugujixowuxed.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/2334567597.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/13704766385.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_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 10788 bytes
SHA-256: 1a8ee084371904aacabbe852c5aa70b5e9b0db6b13c231d2c5785d0c5fba8924
font_01_sfnt_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 18152 bytes
SHA-256: 193505bfed8c2ed1f26480feebe97a252aefeb57b078ea09cad1c47646504feb
font_03_sfnt_off0001542e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1542E 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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