Malicious PDF — malware analysis report

Static analysis result for SHA-256 715da6658fc273b2…

MALICIOUS

PDF

88.6 KB Created: 2021-06-25 14:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a9c404ba0f2ff226888ecb227feaac7 SHA-1: 10822504b4d4b3101fc04b6eb2c771cf3ddcad68 SHA-256: 715da6658fc273b28d8dc7fe5b1a7b98dbb2a2034f0fe468f479b0fc7b2004a3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malicious files or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092de68bed6b---58511282531.pdf
    • http://okmarin.ru/userfiles/file/sukerososivikipukovigabax.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/20b75fb6660420309a699693ecac9778/88737857073.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a45fabe8b---kifavinoxirarusapaxelosu.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/c7b0364e4f4a74d95d5a36437a1726a5/3071973454.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/fd77d619bda64d91fe7a15678a0d8114/21461409130.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f5a145dab---zebajezakes.pdf
    • https://mavibusiness.it/file/34883571517.pdf
    • https://aimara-bg.com/userfiles/file/26093404786.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4d603a40f3151025f1eb64bc0ba337f9/pinudexalupuwaxidituk.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/af1fe8ce30602324126e5ff1c386d057/48030293860.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb8620d4d7---8205021604.pdf
    • http://aliceinformaticasrl.com/user/pages/fepujonulodewezuv.pdf
    • http://supermarketdv.ru/files/file/29270949534.pdf
    • https://pet-fashion.ro/mm/file/96429970240.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/p148mhrk0mdno54of1fna5jil6/93590069836.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f8cdba197---67505291387.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+coming+insurrection+invisible+committee
    • 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_off0000f743.bin
95060fd5367a7cd83d48909cc1af62309d749888ded222caea86e37711c9a55e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 16920 bytes
font_01_sfnt_off000122d4.bin
c53afa3aae453d9f4b60b8dc798ab20446e7a85ae829558d774c29dcbf303384
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D4 10784 bytes
font_02_sfnt_off00013b81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B81 16792 bytes