Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c2e0167f8b68f8…

MALICIOUS

PDF

89.6 KB Created: 2021-08-14 18:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 404e67addda87e2358b765d0e2f17987 SHA-1: 8316df548016221565d5e0ceb7dbe0e77c3e87e2 SHA-256: 90c2e0167f8b68f818570a9a170c4c267f35789c38933770838b41d0e91db4a2
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware delivery. The presence of numerous links to potentially compromised domains suggests an attempt to distribute malicious content or phish credentials.

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://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7aa17dee6---larobejobigubanukonapu.pdf In PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/69312872722.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/dogadukesaxara.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/4685e78e2c48ab91dc43f799cfd3feb3/mazere.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/fdc3dbf5bb19de3a48ea2699d648bdf1/19006429956.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/24237184604.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772763f080c---zisadokozobuvalusopeb.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/48656125419.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/30831848458.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/81196393549.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/togirufunulaxekuga.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/setanegilusekasanafi.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075737d47bb9---12488638244.pdfIn PDF document text
    • https://domilot.com/uploader/files/67654099349.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b8943248213---34460218007.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/54837994388.pdfIn PDF document text
    • http://darienhigh70.com/clients/878490/File/56784396145.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607df93a3caf6---fikudadotexejil.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/19783078311.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608998a311085---7252507617.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45d710bf9---ruxeze.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f96b24d3d---zazimevidadajulozedege.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/1633134733.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/magelavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=etude+de+texte+louise+lab%C3%A9+je+vis+je+meursPDF 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_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3E 18700 bytes
SHA-256: 003d5f24b0db4cef3d2396ed989fafacaedf55913ef0a30604a9d1d671a1c6ad
font_02_sfnt_off00013c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C10 10980 bytes
SHA-256: 15d40bf203069ce5db80c1e4e61d3d7a3e4a5dff5ec86c2bc7f7b84fef917c76

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