Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5061ba1172b4a0…

MALICIOUS

PDF

91.8 KB Created: 2021-08-12 11:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48a14d227c24479f997952ac64299db8 SHA-1: 441b0434128edc6a250e798fdf9b03c491d76ff8 SHA-256: ff5061ba1172b4a0e8186d7faf6e253a7fa9018948fdf3b9f45adada0f4a6577
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://logo4you.dk/userfiles/file/botox.pdf In PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083f0e93b383---48829178187.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/rosivuzizena.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/pisipuputabuzimo.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/rimugubisitasiwe.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/85313639633.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/sirudu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9a2f162c2---41193463417.pdfIn PDF document text
    • http://garderoba.sk/images/_file/forunibanokoxaji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943c8d00949---28883584005.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/92813886418.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/sajale.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/d6bgcbvqno2t112mgg7ebdh9bg/2449480823.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758a8040ef7---18521447092.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/914e46afc871e6d7747def095f4e4295/93105878116.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/3178126142.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/fuzenijozapifi.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608724c055d45---buzogubudazosirem.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608601bdbaccf---65588121000.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f113309f28---16560325343.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/zabaxilusebi.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/6odpume0ocj7g6elkbtt0h1aaa/4753834249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=adobe+photoshop+passport+size+photo+templatePDF 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_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 10732 bytes
SHA-256: 2b79180d64dc5f6847ac382e3043e82b1da66ab1692394b7d70f1bddd1e54209
font_01_sfnt_off00011962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11962 17508 bytes
SHA-256: b3d36f3b1a604be37401c11e5a08201b616fbe69d8144b3f5aa337127835d760
font_02_sfnt_off0001464c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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