Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce8e572496832f1…

MALICIOUS

PDF

94.0 KB Created: 2021-08-09 00:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4807d196d27d7eb971773f5ce8ae829 SHA-1: c46a7b767b74dde2b20fae737299c850c1298a3c SHA-256: 3ce8e572496832f18435e1cc9dceb37daaa5e5dbd75501d34b520d6a50a4cb6f
156 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, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into clicking malicious links. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to manipulate search engine results for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5877786948.pdf In PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/4n39ckhvrqurdjuhan9ataaahl/7152794766.pdfIn PDF document text
    • https://menu2uplus.com/images/file/zasojulozenoguj.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/22529881084.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/kafamudafagogudotu.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/kuzikepirejasuniv.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3474228c49---88523674320.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/15660926103.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/20588816236.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fb25e7b4b673caf88cae00f9508af607/boxobigavoxetaxifew.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7a4727ced0beb519c52c74f6f57d216a/fujeriz.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/jogufalijedewoweburinewu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/30enboluola9fhg53kbvcqddl7/52409117857.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/36d60c0bd4833f2fe7e3b9f037d59796/fitib.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607499fa75ab9---lozotuxasamugipagavowu.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fea102806f---77162831005.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b115a4a60---nozobutetoruwejukox.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/39045557258.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/jiwawupeselemalakedom.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/4228197031.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bfb672e0d---satepamenedorebewunisovit.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0b27db884af3c883ccbb75ba563a62c3/govinawiguzab.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1094c7dbc---41363539728.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/83100068316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=free+robux+no+human+verification+or+survey+or+download+2021PDF 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_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 11620 bytes
SHA-256: 684d5bdc83ee4eefc7fa69cca11867c84716a891453c0e851276011b7ff159f4
font_01_sfnt_off000123ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFC 17396 bytes
SHA-256: a94ba31c4e464b54de8415d323b5e83ddd87786ad58079abf78eccc204dd03a9