Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8b3449c3ce47d8…

MALICIOUS

PDF

86.8 KB Created: 2021-07-25 10:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 45a892799aa59c0b6835947bf25c2397 SHA-1: 3587f0a65c0a27218f5fc1d535a55f1756c00be9 SHA-256: ba8b3449c3ce47d8d0bcff2c343b6d21404bb8dd13e63db84b137272fa978633
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host links.

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 http://thedewakohchang.com/image/upload/File/ifurilibixasavuluwu.pdf In PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28cd17dcb911c029f307cb89d937881d/keduseneverew.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e97f9940c---55715402263.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/23630471615.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607381572bb51---dokanimaviruxarizus.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/pigurokul.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e5e91c3b6198e7639ece58b9893b75f2/lipasibeluj.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/153c5efab0cf3c27ffcf4ab1667e8c3c/39836245527.pdfIn PDF document text
    • https://w4house.eu/file/sojilifofinineda.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/53919528840.pdfIn PDF document text
    • http://mesterek.net/tmp/98754799073.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ced1193bccc---vajamejitedufosadefapopi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7690c2b76---zivoteruw.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cd9340f2f---58769754492.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/7735b3f3fb002da034cac52018b85431/bubasudazijuwijurazij.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/94174322653.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/zigefojejuzerofokema.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/87042704693.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/kekuvisalutu.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/32714513899.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/39986146751.pdfIn PDF document text
    • http://salkim.com/userfiles/file/45411730794.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bc6fdd904---bevuxodefokizeboj.pdfIn PDF document text
    • https://baptistfriends.org/media/12124766791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=basic+choreographic+formsPDF 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_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 10732 bytes
SHA-256: b3ec5b0f42bc35fc66106f21a160037c69d8090a47fce227fe4fc183fd9ae4a7
font_01_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 17472 bytes
SHA-256: 844f4071d9beff56f080030a944f4de5086b2c9cf9cb4f57f4c46dcb5899e61e
font_02_sfnt_off00013552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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