Malicious PDF — malware analysis report

Static analysis result for SHA-256 8514a10150c6bc6f…

MALICIOUS

PDF

88.8 KB Created: 2021-06-29 00:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 426b753eae2364e6a7a2a2a3797fb94d SHA-1: 1a7bff78e72430186f81df076fac71d30e7c3a0e SHA-256: 8514a10150c6bc6f4a8ce10c1db7f9aca56a3b81444e0ae1468eb59e14f1afeb
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other sites, likely to lure users into clicking malicious links. The presence of multiple 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ifahnq0dgnunthuiduk9j4avo4/buwubowepuvuj.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1c55f3068a19981247d6d7c346791da6/kifozogoro.pdf
    • https://digicpictures.com/downloads/10316138396.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/5637aaa8a19d55a32b6ddf11b9f081c9/bekufivefisuvame.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f1a1681f4fbced23faf6740e46cc7556/vasuxetubizujemudiwuroni.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a505e421d---85695984969.pdf
    • http://vhshf.de/File/fipexezotikigurarodokes.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e157d072a---jigufojogafew.pdf
    • https://annjulieskarpmo.com/userfiles/file/gapezajexag.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/59laduiiq0b3ratqi6fnnmnkv1/27799982412.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608363d300ed8---sorijagirorigomulakafuzew.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/dekatemekevowonisenara.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/57918c735906ed93423ae37a4e0c3df8/56135540716.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/96ba560c6fe33e3f55056f2e52cad031/bufinimoliminiwasuwugijat.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/4bdf8ae125e760d4496c591ae9d4882b/mejudosewumeved.pdf
    • http://alliusie.com/userfiles/file/pepeg.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c14131729---65835270195.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pineapple+forest+cake
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f844.bin
0415c7aaacb4a5bef61bd08350fe0f6c1763bb019d3733ed4d044a64ecb36242
pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 17468 bytes
font_01_sfnt_off00012670.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12670 16792 bytes
font_02_sfnt_off00013e87.bin
ea3af00b8852028bd31fbb19d543d47787e2dd2ab2e2214a4e7e137d8413aa8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E87 10568 bytes