Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36f54adb40cb31a…

MALICIOUS

PDF

66.7 KB Created: 2021-09-25 08:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1eed368021fdc9de59131d4fcd6b09d SHA-1: 0eb29b957a820344d8f814b98d3740a2885d548f SHA-256: a36f54adb40cb31af4c2b402917566a3a15f50322751d0c3c16b60b4c457370f
176 Risk Score

Malware Insights

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

The PDF employs an image-only lure, a common tactic for phishing or malware delivery, to obscure clickable links. Multiple heuristics indicate it's a link farm hosted on compromised CMS uploads and disposable domains, designed to redirect users to malicious content. The embedded URLs, such as https://cructi.ru/uplcv?utm_term=game+system+emulators+for+android, are likely used to download further malicious payloads or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=game+system+emulators+for+android PDF link annotation
    • http://turatabor.hu/media/25648008921.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/63940320736.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/ronidexatapupukekevefot.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/7193354506.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323e21cb28d---samomenu.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/19399587681.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148402d75878---46170855548.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/digatuvuka.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///12773862889.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/8b134cd6bd1c2385e716d6cf887adf72/juwukuvof.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/tagaxilagesipinisojote.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210906142813.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/rajovosibapiperuribavobi.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/80102018100.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/pibegogivikeramufenos.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/822053226.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///40108856709.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/luwupanoxowipafuxetuti.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210909185145_gpbdj6.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/vulonemamezapem.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/39699824832.pdfIn PDF document text
    • 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_off0000aaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAA8 13832 bytes
SHA-256: 3f5c6b382f65c514b584a06af1803d4f3da2f8621b41d51c64f82d13374a5d65
font_01_sfnt_off0000ccbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBD 10768 bytes
SHA-256: 1337b3cb5d5409c179ce57405ff944cc11f05af636e71cc4ec1993778ba0a4b4
font_02_sfnt_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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