Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7e21541f5081c0…

MALICIOUS

PDF

188.0 KB Created: 2021-08-13 17:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a04e4c1119e602d2d94b50ee3b9dea0 SHA-1: ec1834325225e187393436f6ae6d008568eafdc4 SHA-256: 3d7e21541f5081c00c5a5c8e51c41a8e5e803e9fa77b30db88179843fbd512b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, indicating a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests the PDF is used to distribute traffic to potentially malicious or compromised domains. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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
  • 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://huntic.ru/uplcv?utm_term=thirukkural+short+stories+in+tamil+pdf+free+download PDF link annotation
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/92b9c6cb2303365e9d3ab5b0fc20b983/42624656220.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608b69df99dcd---57187467396.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/49362331434.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/ac2dc54719b7b126b697473d9582553c/xikeponovipolererujilino.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/74315890534.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/vubawalazeloxuzibixab.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/dafogolekemigovij.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2d2254d693c2ea72532293d69b6f8af3/80269464343.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/epjkmgudv4l0khpbd24rtgpvpc/73853677663.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/7713702877.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f720702fc2759913a0a2f2fdca13497a/17398993635.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/sobulodixiruguredinov.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/31610373676.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/noa8q762chgt41eh6c73bc08i9/34952015486.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///worab.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/2983201.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/83234768223.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4levs5e8nk1iglikahaum5m93m/67959323509.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/90462781323.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea7ff50a9f---burapebibojek.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/losamalutulazimevitok.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1491a7bf22---71442184334.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/laxiresewipezusabunep.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/tubunekafuzagilakujogegi.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/kamexuwezurapagumevoladi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00027aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27AEF 11004 bytes
SHA-256: 63323067714989cabd57cc59b189a1c2eb96c15cf9c56cfa5572d7b814b3a407
font_01_sfnt_off0002945d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2945D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002ac6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AC6F 21196 bytes
SHA-256: 795ed56971ed6341b273f51f4e700be4d6e9eb3b9022a04b4cb2c242dc44d537

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