Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9f62e0eaf91c0a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 18:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4d2ccfd1398de9c5eadc26335206f5f SHA-1: b4fcfc0872e3f3827dc0813309bec41291f628ec SHA-256: 0a9f62e0eaf91c0a542a05a79a90477d3598d8575750bff2cd297be7973a38c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised websites, indicating an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kdwatch.net/upload/files/2021090311594690.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c26d97b6f---refupukidujumazi.pdf
    • http://placidlakes.com/larpm/uploads/file/radit.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16134410a2a05b---71286836278.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9ed8096368fa063cc903ef6928ad1c16/92124546322.pdf
    • http://insfilings.com/skyzone_classic/upload/files/razuvugivopejejuguni.pdf
    • https://paron-rebondir.com/uploads/files/fibetusevurivoredapifejok.pdf
    • http://familie-schiecke.de/images/file/zetopo.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a83cd71cda5ef73be8900751ffa74d8e/56900600990.pdf
    • http://jingkangchem.com/upload/files/tabufazujativiselaki.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/suxaxoxekanorafumave.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/64520481423.pdf
    • https://pasarantogel.com/contents/files/23515870640.pdf
    • http://dpnovelty.com/upload/files/zajuf.pdf
    • https://daqing-jewelry.com/uploads/files/202109060128413230.pdf
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/mapepitafediwolugaw.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/zurorilapagiti.pdf
    • https://petandpuppies.com/userfiles/file/gebefawexisawosirubutab.pdf
    • https://strategie-forex.com/ckfinder/userfiles/files/62593193224.pdf
    • https://ladangmimpi2.com/contents/files/70010951040.pdf
    • http://randoquad72.fr/userfiles/file/puvelete.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/86280647672.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161328b3bb4311---bujovusepexamanil.pdf
    • http://etepi.pt/js/ckfinder/userfiles/files/melifewurasuwalawixuzuwet.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=kerala+tour+plan+pdf
    • 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_off0000dbbe.bin
813455f2e2ed4d8075ac3503223c26a8bc65847d9fa04b39cd7acc4806ed76e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 17524 bytes
font_01_sfnt_off000108da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 16792 bytes
font_02_sfnt_off000120f1.bin
71155c0d5481b83aea28a96ceeec08d68dc5e7f4169ed581aee21b6d6726df75
pdf-font-stream PDF embedded font (sfnt) at offset 0x120F1 10324 bytes