Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42c03e9e6924b2e…

MALICIOUS

PDF

88.3 KB Created: 2021-08-11 13:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5ea9371c363c3e5e37f9b8809f4bbb30 SHA-1: ab544e4099a40d59b7acbfd81d25b9180478f8c7 SHA-256: c42c03e9e6924b2e2bc7216110afa9a053fdedc11a261f50b0c6b832c193171d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting it's designed to host or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/7ce2bda9837ffb8904425a586d4bf01f/74019871041.pdf In PDF document text
    • http://abwmechanicsville.com/uploads/files/36893456489.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/jarofoga.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb1ac76a5c---fifuk.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f334a7f7c---jalinogelaxaletiw.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/27087573052.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/17268461546.pdfIn PDF document text
    • http://medrea.ru/upload/files/35603884691.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/54398525808.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b762f63151b---jibolanalalilowuju.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609dee670091c---70333577392.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/83827490260.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7cb0c871bf---nowonaguden.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/fodusetowuzikagemirazade.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/kuvuwumezuximubasi.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/77499482514.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9679580e5960a9d1a2ad038fdc1cb197/zuzubume.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pubobola.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/xusud.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/kupinidepajiviputubel.pdfIn PDF document text
    • http://apvn.info/userfiles/file/95900737624.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/6vibd6nuj11cpv8v5nntpkqiju/mirovimuzi.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/mexilozikasoniwazopafiko.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/86870207099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=who+burned+the+barn+in+barn+burningPDF 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_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 10544 bytes
SHA-256: 6365533dcd2ec34c93f1d2dc83baafd2977b2a5e9cb105fb8f43beafc20edea2
font_01_sfnt_off00010dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D4 16960 bytes
SHA-256: e39bcede7ad08721b6c3e68e29824dfaaf5ac83418f8754e5ed8ec8eeef4a287

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