Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91631b9f56b8817…

MALICIOUS

PDF

70.2 KB Created: 2021-09-20 17:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a00758e6809b3953e71bc01b29aa94eb SHA-1: 1d92be110966aa36720d8a473f756337090701e7 SHA-256: b91631b9f56b881743dde996677dbd4273b1d9be24506470daa252183e247aea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content or downloads. The presence of multiple external URIs and a link farm heuristic strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://radekslodkiewicz.pl/files/file/85607711516.pdf
    • http://honeystraw.com/uploadfiles/file/19207080206.pdf
    • https://fajanav.com/aym_image/files/lusituzaxigepiw.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8fd4fb4d---79189997753.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/953bf93574b74b6d980c77f127b8d0c1/dijejadaberi.pdf
    • https://kaplaitalia.it/userfiles/files/69211993156.pdf
    • http://newtarrytowndeli.com/uploads/files/suzexasepalore.pdf
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/41899389070.pdf
    • http://asude.istanbul/ck_images/files/23170556315.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf715351d1---pizupenilaguxesixi.pdf
    • http://autosoftware.company/autoresponders_images/files/21594852467.pdf
    • https://foodexgida.com/uploads/files/87455640159.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b402dcb3dc---85952488156.pdf
    • http://brilliantsolarpaneling.com/userfiles/file/vedixegepegifisu.pdf
    • http://www.keizerco.nl/userFiles/file/lefokofakowarufufed.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1614509e959b69---37981112747.pdf
    • http://cnex.cc/images/blog/file/pobopiwumazuli.pdf
    • http://bigcool.net/webroot/img/files/28185895036.pdf
    • http://fkhd.cz/data/img/pomizurujoxuwalimegebirev.pdf
    • http://klawiatury-foliowe.pl/_data/file/siposetadodubu.pdf
    • https://maurinet.com/userfiles/file/89547733467.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=streamer+life+simulator+download+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1ba.bin
c5ee8b47f99abec225dd7e889003076b2529d701cbd8636fe7263841f700be54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BA 16068 bytes
font_01_sfnt_off0000da95.bin
6f67e30cc2feb3b548983bc9682730762d20127db730d089a817341a9ac6d713		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 10776 bytes
font_02_sfnt_off0000f369.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 16792 bytes

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