Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5638047bbcde76…

MALICIOUS

PDF

90.9 KB Created: 2021-06-28 23:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0829002cc8490c1a1420f97df8ac3902 SHA-1: 6f7d89f0011783b6161942911120a45df3c0f745 SHA-256: 3c5638047bbcde76e4610c849f9d9eae271dd95106c32f385dfab7f03bc613b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm on disposable hosting and compromised CMS upload paths suggests an attempt to obscure the true destination and leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://krisoc.ru/uplcv?utm_term=you+re+in+charge+now+what PDF link annotation
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f586e6af27---kunoguxugufatuzo.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714d67b63e4---mipinupa.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16092115378a19---64217336359.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c507d16696---88897991665.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/dizofowebotaluwudigiluwo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7995c92a8b---34950296257.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/oguberhhu12h61e1h5i0uh7e8v/wupikabobodevabow.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/be708b088df5389d79b8840110594f57/viwubateguraf.pdfIn PDF document text
    • http://cga82.com/admin/File/57284034370.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/54215159757.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dba24987fa42a5deca4f62373c0ba784/23260052772.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b33ecd3cec0---fesufi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc90043aec---48120713207.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/c8kdgap39grjomkp3fps76n126/94171300531.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092f5d551646---lotojibopikibobekafix.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608277a5bca14---6594833874.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb49fac034---ruvibizolatixugariwovubes.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebcde99ba5---suvageserugowokebotavado.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/6a19ce366503ef523868c4f08a46f6f4/bozuzupavebugivike.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/46d8239ace463169299b8af64d117a65/nuroludoweduto.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/fijusagigaxoxurokitevup.pdfIn PDF document text
    • https://grancom.by/upload/docs/26945161725.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d052e788f3---sozikimagexi.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_off00010012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 17276 bytes
SHA-256: 350f7569fad56cd982a682e304e7d0dc70e99a41205c5474d5141c58a602eb48
font_01_sfnt_off00012d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001455b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455B 10464 bytes
SHA-256: deba2995686394dbd840bf4d045f570e48451dbcf9895bef48d778abe05c9262

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