Malicious PDF — malware analysis report

Static analysis result for SHA-256 713b5d82264cc36c…

MALICIOUS

PDF

77.8 KB Created: 2021-06-29 04:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ff40922d845d188569d32ba1dd26197 SHA-1: ebf32b3a0f09efb01fb52791997fbfea27e64a6b SHA-256: 713b5d82264cc36cee1303e7369eae16f8b823d5e7bb78a389b2f2a2813d7764
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites that host further PDF files. These embedded links likely serve to distribute phishing content or second-stage malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160776370bba79---27072154941.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/c14m6j0b0g781hjj0ep1d58eo3/xasuperujaguvatura.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799c2109ec3---79820731290.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/8248b4e9e4b775454a78cbd6f8d6581c/latelizakebozoxoluve.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca67eb2a78---medoxoviletowisitinuze.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090374b0c89e---96634495374.pdf
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/0310d6dd3f9b10c3db4b30d95f29269d/nebofos.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e9402fb7d---8153726927.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606f380d65759---46118301242.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160739f1fb24c6---76829502695.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/brmhjvbth97iepbfd2ednsq9ht/56553961033.pdf
    • http://podlahypilat.cz/admin/file/pijapanujojepalubiwodogim.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/5aab867e04a2209a0db7fc8e832bcf98/97565018842.pdf
    • https://foundryindia.org/userfiles/file/23312454489.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075024c9b85c---62466639693.pdf
    • http://drairtools.com/ckfinder/userfiles/files/nurobenojuv.pdf
    • http://computerdoki.hu/user/file/kikawumemu.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac819637ac3---viligenolorex.pdf
    • http://circolonauticofavignana.it/userfiles/files/76318767851.pdf
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/73912645990.pdf
    • http://humanlitech.com/files/files/53881185839.pdf
    • http://dges.in/userfiles/file/zodafuja.pdf
    • https://kasihpaham.com/contents//files/zamadojirusebinuvazunuteb.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736d9be0dab---53003717837.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e00fc0d57a398923ffe0470a27ac3962/falodogaketipi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=loaches+for+sale+near+me
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbf1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 16792 bytes
font_01_sfnt_off0000e408.bin
d0c7171db4463f7045e90d948e7bd8e0ab2e47ba0608932df8ab72aa9b1be8fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 10368 bytes
font_02_sfnt_off0000fb3d.bin
486898d0978f3470b2659595bee7ff3391d28219bad3e99f6c7fc59d52f971c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 17948 bytes