Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cf3f46ce31ae53…

MALICIOUS

PDF

94.1 KB Created: 2021-09-02 09:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d86dd4ef893a32dab0b12125986f344 SHA-1: 4209700a60b079c66cf18ee18ac2c7a9776effe3 SHA-256: 31cf3f46ce31ae53c5bf3968697035d6ef5358afdbe51fa91392f9beab59c925
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users via malicious links, aligning with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e6f3d5e5---sutuxakeresefugu.pdf In PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1625386526.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/90f54084beb2c1b6dabafcad435b1ba8/62508802692.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/b9094e41674e3a059e1eead393718105/wutakikiz.pdfIn PDF document text
    • http://samtle.net/ckupload/files/38090017311.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/b897l5kvui1huk9pl9bakmvpk0/xodaroza.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/xapiziwepum.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/13093927411.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4fb173dd7---49617168931.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b0b6f5c0d65e05847e31b22b6d293022/migugitufafadifokoj.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/15381fb528e4428e44c22688efe682a9/wimewobulemigutuxetozik.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/55567790882.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/neduwewepi.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/minafavogutirevekogew.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/210828000957731376pxgpa138shoy.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/36818021141.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c1a35e016f08604dac026b85183efc9a/67970959350.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/goraxaran.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/54059319631.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/cb1ef4c620934b561f6aa56ce38499ae/21162746066.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/51749041071.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0e9b235f---bukuxoj.pdfIn PDF document text
    • https://latework.cz/soubory/budeloleribesaduwamamekak.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/5624115949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cbse+class+10+physics+chapter+electricity+questions+and+answersPDF link annotation
    • https://mediaget.com/userfiles/files/20211152454.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 20032 bytes
SHA-256: 68d69e580f71a32937d951c3ff6ca0f6091a24d686dddafeb3b2363705de6598
font_01_sfnt_off00011fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB1 11400 bytes
SHA-256: 2322939da466158974f566c7abdfac6761fecfad6e5bf1023c13ed8c350b37f1
font_02_sfnt_off00013a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001524d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1524D 16316 bytes
SHA-256: 67a3482f34e37f76c696dbbda58f7bee4a8bdaca09e73d5dc70331f506ae05f2

Open this report in the interactive analyzer, or submit your own file for analysis.