Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dfe0209c4dc8ca8…

MALICIOUS

PDF

74.1 KB Created: 2021-09-04 23:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bea2fe8bce31a1a37467d804c56c2adb SHA-1: aa664a2218d5ed6886c8c611834393efdd135d61 SHA-256: 2dfe0209c4dc8ca887893128eb22d1d56ee66c1336edffa09fca2852b109ddf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL distribution are consistent with a malicious PDF dropper.

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://x04ydivan.ru/userfiles/file/wajegetovagumakugibal.pdf In PDF document text
    • http://machulski.com/public/file/83987216597.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/futeparozawelamo.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/56052445416.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/50018034273.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e668a2905ee---jutanosulapedab.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/83d3b972b9efa4ceb2c5414bc4b01c8c/29750065202.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fef3ce742b7---rafox.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16105721b2aff2---piwon.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/wuletebalolomopodugenagu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c19af415a34---45760232258.pdfIn PDF document text
    • http://synphabase.ch/upload/file/gulamajomigixenazo.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/tosapozer.pdfIn PDF document text
    • http://sinners-party.de/media/file/seresaguvuje.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/8445314520.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/cr3emdhv26grjpc9kr09edql23/wofopazakavu.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/13835770569.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/wifudufutumeta.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4442562ed8658ded2f77d60df0a75dfb/63376245957.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/10a77685b22a2cbc2ee14581616bbca8/95748876927.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106452993823---bekupesijixi.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/2893512ab31842f4affa7cc322cc0b12/xuxerefizes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=computer+programmer+book+pdfPDF 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_off0000be95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE95 16956 bytes
SHA-256: 414260480d5f53e8ec21ee41495cce4847286a7a56cd293d1a1d3902ba3df68a
font_01_sfnt_off0000e9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 10796 bytes
SHA-256: 1628e629ed579ea2efa71bbfaa5a26c911fb7d0a36c4cbe54d20a2022adef226
font_02_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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