Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b1bb955470479a…

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 10:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9c126496dc38355f964e4035c779470 SHA-1: 6d9989ed94f5ebfb725025b6a43c213f537b5fde SHA-256: 39b1bb955470479a2b0700437fb5c5868f12a13f3db55361813a46bc987cd664
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16121842e2c3a6---56258420391.pdf In PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/72fb352b0424fa9500f1d5cf92b21b60/betifiruwax.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160800c7243489---pitixurixabajib.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/86271391280.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/jexanamuleti.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/62a9fb7930107716e5cf942897fdd142/nuboson.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/43702701711.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/94256517243.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/dezovekoduziwogede.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/sfominitg507ikbku5qq24qo2v/goredejulivabebaruwuvaxo.pdfIn PDF document text
    • http://stolocatering.ca/clients/874514/File/xepuzozavif.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5dc84e532---lajiton.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/43235693213.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/49314dc02b583fc4e47173f658497184/61759594017.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/3559753336.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/6dbeb82e03910319b6a8a81f6d0d0dfe/voxasigugikubuxa.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/jojasebisozibijorodo.pdfIn PDF document text
    • http://renknh.com/ckupload/files/gubawejidefepuvofifij.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/rikuzopaxawaretiwes.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/kg9f5n6u4hr5lqb1vflk82j6mp/45723367053.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/xipefup.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/1237792885.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/66619077657.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b21aabca---70988510342.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/7e37be125173e87d369b0fdab1d85a34/60379457540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=eva+sees+a+ghostPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AC 10092 bytes
SHA-256: b5793be1a850ac519adc7c983e4070b3d1d79775d92d71bb2773e671e5f73e7e
font_01_sfnt_off0000db55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 17528 bytes
SHA-256: 227464e683305c3f372b209a4559da470260d02c6fbca3f8f6069f03d1d5917a
font_02_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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