Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db037df8cfe4e6d…

MALICIOUS

PDF

93.1 KB Created: 2021-08-21 04:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d977f00665e6684b9769b59d58247f98 SHA-1: 0ad06d8529f42e0a516c03a2a2644921967a1fe8 SHA-256: 8db037df8cfe4e6dc6b19cd1e4df8ec809fe3fc286b0af46f705fbe0f4653c17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious content, potentially leveraging exploits or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://smidgel.ru/uplcv?utm_term=tips+in+days+gone PDF link annotation
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27a97c2604---38945564121.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/35517281065.pdfIn PDF document text
    • http://asfalon.com/__files/file/7875718354.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/saxulepe.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cac773e3681---12765502698.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16093a83d91448---lovusomebep.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa08d6604c---rafabokeloxi.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/52654002190.pdfIn PDF document text
    • http://nprofit.hk/userfiles/35231841461.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aad21f6ca9a---22710937410.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/65m8bh8fc1rg8287icm3o66eal/putol.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/karodegoka.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/97433963973.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/ruzama.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/gagibo.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/90391441630.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b97ec7b29ed---85859633885.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/nelovuvuvakozabokedovex.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/8e86b1d170bfb48ba65363fe1d8a5877/dawuwaf.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/takugefebenugoxaz.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab10455189c---33959564878.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/berutemuvanimajexanor.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210713212714.pdfIn PDF document text
    • https://fotinepmuveszeti.hu/kovagoors/uploads/files/44880527218.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_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12300 16776 bytes
SHA-256: 9fda07a1e2e5befe8593b5ad1355d4662c737d40dce1712fde0954515d6c91d1
font_02_sfnt_off00014e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8D 10400 bytes
SHA-256: 00ca185e9ca23797124a2d497e3c3a475f69a0c30b12ba0723b788424bab06fb

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