Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02a8f1d9f41973c…

MALICIOUS

PDF

77.0 KB Created: 2021-08-26 01:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 48a24f869b5b8d73d8472a7716be7faf SHA-1: cb738ac0bc39e50d5df2a15733fbd8f2b4953697 SHA-256: a02a8f1d9f41973c2d20bbbe06843f922042afbee9755297fe61dcfdc283f1c2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/u9sg9h79lnath2lft631q8f6ji/tejumosufesupobove.pdf In PDF document text
    • http://milwaukee.center/userfiles/file/98143947869.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/38414861577.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/31005267596.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f8d96099d---49091885326.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/dulipawabop.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/toxiwugu.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/3725214427.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/92835479542.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8c5aa18566caa01c5f1f3bf3b53e0109/31221023726.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/7ff62b96632e71042a97fe39e4502e54/rudebigumoxanowatelejiwod.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/artcjmnei92gcmk4navfto8lc7/64024100716.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882ee7336c7---sazenofimivefuwoliwomati.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tgkllmhdaqfv7vifgsrtf194a2/gokoremutejamemumofabi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61f568b82---dimolokapupebezeratar.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d0a63b25---5000159983.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/naguvabopilutumizaduruvit.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc227807104---totawefimarawutumagumu.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/pepawojotipavajekoz.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/66885051172.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/fa91d69aba9c3a10335073b6b0526d63/pozapumixulew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=shell+shockers+unblocked+games+77PDF 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_off0000ca20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA20 16604 bytes
SHA-256: c6b325d4bb97d07ff118c85b29695c904be9d6c96a1e9816f41470d00b8da486
font_01_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 11084 bytes
SHA-256: 29dd7c8e8a30a03dcdfe6014606f614f10fe3abca803dbada141f1664c4b2e40
font_02_sfnt_off00010e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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