Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d6c141341c623c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 14:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5721d04da845a75886138900d0f8077c SHA-1: 94007ad6bf8d8b55113f140def07023a0189fe73 SHA-256: e4d6c141341c623c46634ad2811fb63394b15af623926498121584b1cef22c97
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URIs, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://dortmundpools.com/contents/files/xabijamufa.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f272b2eaf---19857778745.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56220190014.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/tugubefotozoruwodexaxu.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61340bb8d3608.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/losufoxetitedolukelew.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/97793461837.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/38773310767.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3178051b---sopezer.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/38251768729.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/jokurinituribepevenuf.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a5959340f4b43d36adf9d9fe813acead/powimasitada.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/19483066917.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/13150920396139bd41806ab.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/93673138461.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/12270740265.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613203e9f00a8---31128068386.pdfIn PDF document text
    • http://happy-land.hu/editor_up/67091054989.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/puluzaketitelelonudorin.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/20140579643.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/katinabutowofubaviludowap.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/somepifef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=minecraft+gun+games+onlinePDF 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_off0000da56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 17480 bytes
SHA-256: 6d2c0a47d8051e584bdb6de0f425fdfd18a98015c9aa48a2cc47f2e990deb81b
font_02_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 10772 bytes
SHA-256: 17f687a00d249a1ba8fb452ac6116756178175869abaa0a5bcd97a72610b14f8

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