Malicious PDF — malware analysis report

Static analysis result for SHA-256 108c02c2c4e59cb9…

MALICIOUS

PDF

62.1 KB Created: 2021-06-20 18:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e62375e33d599fa9800c8a4007dc22ba SHA-1: af4826c97f156aa32bcbdd77b46fa6b64ba1e86c SHA-256: 108c02c2c4e59cb9e35cfac4d03a7b567d7c567fdd41057092c459526cf43f78
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to trick users into downloading malicious software. The presence of 'utm_term=usbutil+english+download' suggests a lure related to software utilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8027

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=usbutil+english+download
    • http://accronline.com/userfiles/file/39008961890.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/me7odb88p9m4413m0jc4q500d3/xowudorewimuzomaxuve.pdf
    • https://vestol.bg/files/file/7683284911.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609877518d2d8---bolif.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12b9f9d86f---piwobuvebozewajobojosilin.pdf
    • https://akapacha.com/userfiles/file/68788920834.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/48586856c13bfe6cd8cab62493ce75a7/37882017182.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e80ff99df826b925163399bf76518e01/28807945436.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f18a6d8c7---40821849475.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/010aae3157701cb12fc4d3c374acbd07/zijosekabunosemobenox.pdf
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/80630089407.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/bb14abc299ca51d738258e320628481b/75575473407.pdf
    • http://romanakladatelstvi.cz/userfiles/file/fapezazudowodu.pdf
    • http://tfforming.ru/d/files/95555430958.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a616bb7d9df---zexonudo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9fe.bin
f78d9cb6b9afee162b16677d0c86eeecbf3b1a9af15d11752240e9a09bb28d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 5096 bytes

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