Malicious PDF — malware analysis report

Static analysis result for SHA-256 db441746194a6812…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 07:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ba0cbaad9348e30e5a47c131b4db577 SHA-1: 2194bb1287fe774c99100991b6581b3c09bd8401 SHA-256: db441746194a6812145c22053c4b53d3383a555bd5dd29b523705ca9c9b1f155
236 Risk Score

Malware Insights

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

The PDF document employs social engineering tactics, specifically a 'Browser Install Lure', to deceive users into installing malicious software disguised as a necessary browser update or extension. The 'ClickFix' heuristic further indicates that the document likely instructs users to execute commands directly, bypassing typical macro restrictions. While no scripts were directly extracted, the presence of external URLs and the ML classifier's high confidence score suggest the document is designed to download and execute a second-stage payload, likely a phishing or credential-stealing tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crewmak.ru/uplcv?utm_term=omegle+video+settings PDF link annotation
    • https://weilaimachinery.com/userfiles/files/vonugopojaxatafa.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/soziginalejaxaxanomokebil.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/46369246881.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/33976132230.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/xukuniwozikusire.pdfIn PDF document text
    • http://wohingltd.com/userfiles/ripuwixigefugit.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/20700381544.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/sologu.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/purok.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/9456346288.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/vebifogigulejemog.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f1255a3a7---wenepudomoxixanofosiza.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc53c7a61b---vuxufunizinesakugimodimo.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/63534475782.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/42797222335.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/13174755422.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/25410617574.pdfIn PDF document text
    • http://emeat.ru/var/files/2740969505.pdfIn PDF document text
    • http://tabletopad.com/images/file/54105620644.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210920085951.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/givesuletaxewibijimibe.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/duleduvodewodedax.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/17883ea481d949f49e2caa1cfc936d2d/9142047271.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/48140177506.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_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 17656 bytes
SHA-256: 8afa3a6f91305cc5739a636e95e48d455df50a4b5a7fbcb9a314d7c61b0f0c22
font_02_sfnt_off0001223d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 10420 bytes
SHA-256: 078a011636e4fe4aa296d14055c8ca06262fe4012bbc88181750bef65a26b1d1

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