Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37e03073cf72b17…

MALICIOUS

PDF

81.8 KB Created: 2021-10-24 20:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ff953a41b11077f42aa0780ac7134fad SHA-1: 798f88b88ade5588daa498dc38bc12bd344ac7da SHA-256: e37e03073cf72b178e1a6373239c4ee29d073c1e4fb0d2e0e207e55dfd169f54
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable domains, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs clearly show a pattern of redirecting users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://tzoetemondje.be/uploads/files/juresowaxokokotagisizi.pdf In PDF document text
    • http://stopguepes72.fr/userfiles/file/mobubelisebunutodo.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/nubikilujewikafodekutuzin.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/93204113846.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/35741304769.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614832eada958---jowelakufo.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/99036841963.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1616cf12a77bc8---13707197323.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/74124585458.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8iq7a8dvk7s9vrrft4lmpvuj1q/82612297104.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/bozerevujam.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/muxanem.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/60071928784.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140363f9eac5---67064550109.pdfIn PDF document text
    • http://szigetkozpalinka.hu/userfiles/file/52349423204.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/dupubafajojojijamed.pdfIn PDF document text
    • http://rurisnet.org/images/file/50314700621.pdfIn PDF document text
    • https://comfort8889.com/upload/files/waxewotutelaxu.pdfIn PDF document text
    • http://mp-journal.com/media/file/sizalujugimafebobegututof.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/wiwagowomuvepuja.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/47697953228.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/31604350568.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/93708232884.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/pifufolomataxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/4dZi1sgP-vI/uplcv?utm_term=normal+temperature+of+hot+waterPDF 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_off0000d7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 10420 bytes
SHA-256: 31eb09b89bd736a968b87da03bd80b14a579595687c931696be1e0c32725251f
font_01_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 18992 bytes
SHA-256: 83b7717340119855c8b97a48094650f75bd1885641078f763565b30657c21d7e
font_02_sfnt_off00012164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1