Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b0e6a414a7f71d…

MALICIOUS

PDF

118.0 KB Created: 2021-07-26 04:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a90e176a13c1fee1ab7441ac0a39f450 SHA-1: 9c010ac968e9f5b8f3791f938d5c98f2658eed90 SHA-256: b6b0e6a414a7f71d66f5558050a40b681c21817d95228405668297ee87f148a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

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 http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac724e78cdb---64540501450.pdf In PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607050087aceb---jifodekajudoz.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/jakabisotikuzawotorebo.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/20f34c4b8c28801103b3c8d746e036e8/jewaguf.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/16104338816.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607436b6d96ed---naxaloraju.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b7d0449f5---vaxelumovakebejiv.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/maxeg.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/64908177515.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160899b5f6d983---gopugebajebiw.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099adb241fe4---dobumik.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/fezapa.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086a7458b57c---16393439101.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/8286268938.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/9aceb63c5893216b988dbad3cba1dd1c/muverinekabolizis.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3945c5ef73---jilugip.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f002ece3307---vizikelusebojunisurup.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/948b3705c4829edfddff6944704832be/19678053867.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7abdc4a2f5c5fb1f0ab51d641e40aaf0/94898528296.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/jujajorotedufuf.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752ad63b09f---wifiz.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/tozotekitepakikaw.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/domarijaruvadapusekuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=aleister+crowley+book+of+law+pdfPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15168 10920 bytes
SHA-256: c4f30c2f6034dcbd0bf9d2baf8db29b2be400d179b84e13460d1434484ba58cd
font_01_sfnt_off00016abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ABF 18680 bytes
SHA-256: 7e60520b44092cc3b48c5d83ca73adf27368a66a7e65cd028a285110e17c9672
font_02_sfnt_off00019aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2DB 16156 bytes
SHA-256: fa476123058572f6f577f07035b227510bd24db646c909c7cfc282885b4ebf8e

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