Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c6caaaf63ea65c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 05:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12c849b673274358cc3c58414a157736 SHA-1: 8d0bfee0bbdc9eb131fef5811ef230af192d8e4c SHA-256: f0c6caaaf63ea65c15892f6b62e2e3d1a692bd576acdb1d0b0cb192db9607da9
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to disposable hosting or compromised WordPress upload directories. The document body is unreadable binary data, suggesting it is not intended for direct user consumption but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bbfederico2.net/userfiles/file/guzowipomudeg.pdf In PDF document text
    • https://stillwaiting.org/userfiles/file/gugiz.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/11547058848.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/mipopaso.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142a2944804e---liwekorawukawelajuvaven.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/fitew.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/febopuvexelalijivopulik.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/zozipinabisudobem.pdfIn PDF document text
    • https://festacontinua.it/public/file/47363313781.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161428262f2cc3---nuxigemufe.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/62594587446.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/75857624502.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/33380452090.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/11297499726.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/87861304227.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/1515546928.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/repizuroganemewolowu.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613441fb6341e---17109578357.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/popemapizuvoropurago.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/36893068576.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/lelefulev.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/satititufumix.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/luwemevikisevolidibudol.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384c3054159---bogenupejuvereti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=change+playstore+emailPDF 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_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 10844 bytes
SHA-256: 68e3317d055588992fcbea53f316635bf3ffbc3b89b68c585ae8b1e02651a5a9
font_01_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 17576 bytes
SHA-256: dec28080d403e535bc6f3ae5025def2abe42399c44e3672be2c6a63cae386e14
font_02_sfnt_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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