Malicious PDF — malware analysis report

Static analysis result for SHA-256 14fe4ce804b740a9…

MALICIOUS

PDF

95.9 KB Created: 2021-07-02 14:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a4dc0ce48a86afadc9c5d3d65561d552 SHA-1: d4cd952d7c3add292ff1dc8ab2a929468ce6db2b SHA-256: 14fe4ce804b740a96d3e32f0658dc481257c168ea44dd650a75b740a35c515dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, directing users to numerous external websites, with several links pointing to compromised WordPress upload directories. The PDF's structure and the presence of external links suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://uctodane.cz/UserFiles/File/39816759573.pdf In PDF document text
    • https://rivaflo-south.in/userfiles/files/27476564320.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e5db6060042f5bbf62f917c04b5af3c7/59709640239.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160902a75309f1---89546793656.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/t10r39mk4fgf34iu1iovpuba1f/tajif.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/399228d3e50dc4a47031362031a66923/vexiben.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/zolagutolabopit.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d2ca0fca5---12752238720.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/iavfbsr182p6o4t9rt9h4j1t4j/17822255316.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/oro1p2ci35n4rp2qosk2btrl9n/8603602348.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/jokebotejipazi.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/mupozofokilusamuronolaju.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077785655af4---42491430619.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/posaloda.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/79567141122.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b738ac0a29---lajezowikenimuxuj.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210616063256.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0ae8a15343260bb07cf8f0898b785487/17397647676.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zowetunapudipafimofudumo.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c769505449d8d4b8ad6dbba6582ea9c9/73402716789.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d20eea9e0---445983898.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/63be6fefba585ffb57349a5ee9b18456/39611464326.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5508003818.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/9jqa473m1ke7ti9trutvgfel2i/tozakuvolikejudamumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=a+history+of+art+in+africa+pdfPDF 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_off0001157e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157E 17184 bytes
SHA-256: 92441745163e32ec5c66a138212cbe5ddf2939b6b0f89fa2f9e2dfbb63772ed7
font_01_sfnt_off000141af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C6 10636 bytes
SHA-256: 165f1f431c66c02e68e61a91711818b85236ccc24c52aa1151071cdafc05ea85

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