Malicious PDF — malware analysis report

Static analysis result for SHA-256 a994ad8949d1203b…

MALICIOUS

PDF

104.2 KB Created: 2021-07-07 18:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a0955caf4f9acd0112add471c96a5a09 SHA-1: 4fc43f35cea8588636a3942025d28651606d57de SHA-256: a994ad8949d1203bae9f27a8051fd7b6f5f6f2b311f1fa9bdf97aa8ec0cd35f0
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple links on compromised CMS upload storage and disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://autosoftware.company/autoresponders_images/files/66435529529.pdf In PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/o1d1ig1110jntg9966i330563d/femogegi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/l815q8t88mbafn09e30h9jki07/jebezafamuzutulik.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/8lm0e7jvh7a6u6ri0nitn3im1c/13864869523.pdfIn PDF document text
    • http://ponyomaru.com/files/files/nituvirina.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/165cddd6feceb43d5c12c8a3461491dd/soxebome.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/9593466910.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/xamokobexikopopo.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/90043383076.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900c932ee84---27159911998.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/kikeluluxatevutipisej.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/831fa20312d844992612cb751f19362d/guzemuji.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/d375a05s03ar7cacp6rsvr6jim/gesofolonofibegufudof.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d97c8f8eb0e---79082690213.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a97db6ec436---fitigabetemuz.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ada05a74857---kilok.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/sukik.pdfIn PDF document text
    • https://gilbertems.com/videos/file/17042029017.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/1416580253.pdfIn PDF document text
    • https://epos.nu/ckfinder/userfiles/files/5998207626.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/71152552004.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5da3d24795---12878472768.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/213e703c1c3f4a72a644186aec399a9d/kugir.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/romaforixifog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+troop+nick+cutter+pdf+downloadPDF 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_off00013056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13056 10788 bytes
SHA-256: aa7b40ce8ca00d5a14678cd7bf9e1c49d5672521be4c61fe4311a35679b1bb68
font_01_sfnt_off00014930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14930 19744 bytes
SHA-256: b65ac482f03e5d2a47f472809d7ec4e2b353995693f67bef7088c76d6530b93e
font_02_sfnt_off00017b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1