Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7034df83897201…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 00:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2845bce7d7f150d221ef96e8b2eefd29 SHA-1: c48eec837eee98e235c733ee7a746e2bc4486b3c SHA-256: 4f7034df838972015f3786854417b20725089310b3e14666acf176a17367c3b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://drafthe.ru/uplcv?utm_term=video+call+app+pc+download PDF link annotation
    • http://sgrdpandher.com/userfiles/file/89625437764.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/pugudovufugabevi.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/15787316656.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/ranuroroligopumililubo.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161425ece95f3c---zodigulokepewamakivu.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/tekulive.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/61542256469.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/duteveziti.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/rogez.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/39413675057.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/45b57ad6a8bc8248a77853c65cc29339/31674752284.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/ninewunigubipariw.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/talelokexitaxasebalug.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/87037739406.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca6d292c8c---51772042992.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/30306090014.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/1ee965eab2ecd610bb818ad1f47bce1f/81508600081.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/marupofavi.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/64772595240.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd6517da48---lopigajupesezobi.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/garemusedupijukus.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/81702033788.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 17052 bytes
SHA-256: 3c616760fe669561864dcbfd8f97a548525e9598629129935269949b89bf2626
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 10196 bytes
SHA-256: e685382162c293b59e41165200b1bcda57c3b86566353ae4f5394c2774b3772c
font_02_sfnt_off00011ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1