Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1c56ca0e396ecc…

MALICIOUS

PDF

101.8 KB Created: 2021-07-19 23:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0c53279064c0d2ceb16935ad95a384e3 SHA-1: cd8dda27eb256c93e060d32126b020887c8c13a9 SHA-256: ab1c56ca0e396ecceb8484031f6a8e85cc3764b62a8bb0492f7b1fbcd48ddce0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3653c7e2080b9a4a47bef94fb341051a/86320426566.pdf In PDF document text
    • https://studiovizia.com/webroot/img/content/files/40938012718.pdfIn PDF document text
    • https://service-panev.com/userfiles/biluboziwepadu.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/difitugexelisogowuf.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9ao77il06kkv1g8jbghma45f74/53798014531.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jt4j912p7aeb48m6hbri5c72s7/vujajagakaga.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160870f94c4e8e---80918617644.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737fee99dc0---razuvimusum.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/31270046636.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/36275253631.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/33583231892.pdfIn PDF document text
    • https://latework.cz/soubory/nuduruvoluta.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/82375391570.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/2191615338.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/wofulezuleme.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/f003812bb470e5821bf614995112c66d/dirurojalanexudadejak.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c492d413606---wunimazawujiwu.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/321703997.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab1f6672d1bbf359beaf794b89759bd1/tewibux.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/f2682e40521c6df7fe44f9787c451c6d/xosumomijezabade.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6893a2cb13---domopob.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/samosobalamopa.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/r549m3adsmhk0kt4kdg8rjuf1e/rerogulofukurividutiwixi.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e76168f1e72b1975738bfe4eeedf7bde/nizipuvad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=lcm+of+2+3+4+and+6PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 18208 bytes
SHA-256: a228daced80c0fadf8585ae1840d29d88ddb309858c09175b3727d3cc6dbe226
font_01_sfnt_off00014457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14457 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_02_sfnt_off00015983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001719a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1719A 10496 bytes
SHA-256: 5cee924202e184bfb3626ede65251ed1931918e14a43aa68a7a8d52be19fee40

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