Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced2b9ab0d13e952…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 01:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 891819820d2d72956abe2661655a5a34 SHA-1: f17adc2eb54d2b5b7dc4dc956e754eb538856061 SHA-256: ced2b9ab0d13e952b4b414590cd4e6f1b05b34a4329ef9cee66f8329ae1b1638
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://behbehaniprojects.com/uploads/files/fibifofixotizopupakugop.pdf In PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/12923445858.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/71974346104.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/wusojotofiseduzevo.pdfIn PDF document text
    • https://avenue102.com/uploads/file/wipuwikowuz.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4163c5a06d93b1659d82b6e7ee96d464/16974503441.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fec874d257---50167554622.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/gezosovuxorowepawi.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/ganugetuvibewikopazeb.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/pufirajijesevazir.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/99617826639.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134aff40abb6---36418614729.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/71484166483.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/luladeba.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/18713608695.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/niwegimezanoxawisarodo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f27535ff94---25395674941.pdfIn PDF document text
    • http://webursitet.org/Files/file/nogadisi.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/pepagibilim.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b1de7e34b---kejuvilumixujesa.pdfIn PDF document text
    • http://namngonviet.com/user-/files/63890297924.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/31622220804.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/81929099157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pumpkin+couscous+salad+donna+hayPDF 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_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 17636 bytes
SHA-256: 7a44f1b7fe997776e345345e03e70937e8727ae49e75ab5d2af9622b23c5308b
font_02_sfnt_off00011950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 10756 bytes
SHA-256: 45155f1e7d175da5ddc14b7260d7f54c1e6d208d51fb233de17a23a4ac05c5c8

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