Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6dd91d3ced6e03…

MALICIOUS

PDF

186.9 KB Created: 2021-07-08 09:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 224d7523c6f442167db34655ce2f1063 SHA-1: a8d86265f35ff023f56d4f52dc20cef41061d6a3 SHA-256: dc6dd91d3ced6e03281a4ab9d914dcf33094cb35dd0888906f39457acb2071d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware delivery attempt. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to host malicious content. The heuristic 'SE_URGENCY_LURE' further supports the phishing pretext, although the document body itself is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cf2878c65---57209192646.pdf In PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b66f0be354---53707090896.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/62626949203.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/35502103364.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607048dd6bf0f---60127163470.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee504a93f6---37482032795.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53b675e4a---risoxiruv.pdfIn PDF document text
    • http://kalikraft.com/images/file/pakefogedinasupujap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca678da837---sadumetibigutimud.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160847c42363d0---xuxujapelodurenakiw.pdfIn PDF document text
    • https://digireg.cn/upload/luzunesekeliki.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608859ec726a2---10179179947.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/ropazikojodadibilanuleja.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/hkqsnoisgfdumcv7b75d6mg4e0/83417144510.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e48f89c40f---53788482024.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/27126323552.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/3b9cf3a322b0f031cdcd5521734349e4/zofedaw.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c29555dd82c---filuzafopun.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/4961f3dfd7487f4868c3bdb05e06cfda/3385357844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fatal+septicemia+in+young+calvesPDF 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_off00027fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27FDD 17240 bytes
SHA-256: 49ff2346d9cb43735a7378bfc4eac92777c1f3c3893a842eca74ef4bcff4d6e1
font_01_sfnt_off0002acf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ACF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002c50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C50A 10876 bytes
SHA-256: cabbd842987d3c387d0947b66316d971afc7fe0cb59cf963076cbdefa3b3281e

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