Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ab0d8e11ba8f42…

MALICIOUS

PDF

70.9 KB Created: 2021-07-03 10:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e12709b3433383ff4ee49e7caad2d970 SHA-1: dbe4dc461e5a59e0605bdf0c5bd6a685a6596450 SHA-256: c4ab0d8e11ba8f42901bc73ade410c56047cefa27bbaedd5295c6624f985f7e6
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting it is used to distribute further malicious content or phish users. The presence of multiple external URIs and link farms strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=one+hell+of+a+day PDF link annotation
    • http://kalikraft.com/images/file/pakefogedinasupujap.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/ec317f836d512fce396228b6b63a6fd1/wadutesujegomixusab.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/2d3bc41de6109e3f5c29ceef86e476e1/14916990533.pdfIn PDF document text
    • https://turismoporsantander.com/aym_image/files/pisonifatolasarupikagi.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/zivamagokojotuda.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/76373103447.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/binuxojit.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/04cfc1e6464097f1ba56ae1decf4ef60/57963797886.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c1e3545d1656c0d48db65398b3cf1627/fazidebubon.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6c0b982571fbd6cb591c51744859f356/navepurofexigam.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/34466718223.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/xerukuzadukepisezu.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/89299235f4d14ef11654052bd1149f97/17826909420.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160747a4035db0---60525050689.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/0ol3gu3gftr2k65htiuvdolkko/1080461741.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/85429f95b592afc4dde067d0c162c978/sagalelurofi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vgt0auqlva4cs39u7noe1cu6jb/91201348631.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cd3f13599---gikotixanujegatodiguxifad.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/37635285198.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/93294059156.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/lisajeriza.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/puzotajafipoxazi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/f4tqcmfvaiccq8clrkk26viskv/nosises.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_off0000b7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 15784 bytes
SHA-256: e7cc0fb0effd7e85d6cad9d0089a040e5f6d375cd94bcd0f185b61aceb4fad32
font_02_sfnt_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 10132 bytes
SHA-256: b694b3a6f8cda5fd77b9fe8a41ae0935b36b608376b136ee868b59c1b9273d97

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