Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a055d51b71bccfe…

MALICIOUS

PDF

134.0 KB Created: 2021-06-14 06:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b681f48a71a89bf4d0c6307407a72b25 SHA-1: e5f529ef6f84a8572005586c151f0e52e52376a6 SHA-256: 6a055d51b71bccfec80c4daeffbe5a8814e14e70c59aebc70e07301bd5e90756
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document contains a link farm with numerous URLs, many hosted on compromised CMS platforms, suggesting an effort to redirect users to malicious sites. The presence of embedded URLs and the overall structure point towards an attack pattern designed to exploit user curiosity or trust through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crysiq.ru/uplcv?utm_term=the+jungle+book+bangla+dubbing+full+movie
    • http://phuocthuan.vn/images/pic/file/43928843106.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/13644258786.pdf
    • https://nmcs.ca/userfiles/files/38809008704.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/45443908141.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/72cbaef6b63b16d218e9533fbae6665d/62844686195.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/1a004c8756ca82049230f89ada724615/moxedorekan.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab4eba5dc---sigomog.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608329049d548---42483810877.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec4b9eed63---14014318881.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/79eff258d7fbed87150b31a4d7b44a80/58335661963.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/43ab66625d31c9b8ad26ce4266a116ac/mumupovupob.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/sirovaxagivamiwul.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ur5nt4h0e4v587rmdgsb9t2n50/lamemokusena.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/53326221453.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f938c30f6---73931423610.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/5382152b6055330107313cff590a3db5/47207725160.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d7c4.bin
b6f9243d4a32c559f7a0d8265c3df46b9d98b9f48a833ca66a064a61c1132418		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7C4 5336 bytes
font_01_sfnt_off0001e9db.bin
0bdb9250d4a37629c728ecf11d3688b3316d67deec7da631eaea8f94dd16ab8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9DB 12352 bytes

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