Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb8ba8f8df3ad03…

MALICIOUS

PDF

108.9 KB Created: 2021-09-02 06:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e4edc6e90f92f0fff692447e6eded01 SHA-1: b7a79b299afb27dff6c3c62610d928ef24ce7f49 SHA-256: dbb8ba8f8df3ad0354587e339abfc4ea7dc139b05e1593330310a150ea254707
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The presence of a 'LOLBin run command' heuristic and ML classification further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=avengers+age+of+ultron+full+movie+online+free PDF link annotation
    • http://omonetach.pl/foto/ilustracje/file/falivuvolaberixoromisajit.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63400c63f---nulixijezefifipiwiz.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608783a710596---jekasumam.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/56578720090.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d11c7cad1e---kutixite.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qgrof3h1q6bouslfolbe820h69/82364633395.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb189be3c1---kedexozevikuwufuwologowa.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/tilukadidojafejisazi.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1617733f7f05112a3ed00d8a680a9699/82548131616.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/fetarebekodud.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/togeto.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/gifefozajakuse.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/nofebepi.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/73698871576.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/35358224271.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a037ab0a0---vaxugolu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de503c4311a---xeguwekixogogurugotupotom.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/78625658844.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ebqau4t5n6je4sjudgc7nkme6n/moluvewap.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/ddf1f8ebace3245c791c84c4f9342ccb/pubarepudovexize.pdfIn PDF document text
    • https://www.lloydsunder30s.com/ckfinder/userfiles/files/fenosafi.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/78395645697.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070abf2e6ad7---97153283048.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/79a3ca3869bcba98ef686f0767384e2d/refajaju.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dd0a42178---89524023754.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_off000140c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C1 10704 bytes
SHA-256: 952f12931a7fdf313014c9fa8d495a39cb7de7b393847d8ae926e3d3e335aa79
font_01_sfnt_off00015962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15962 19776 bytes
SHA-256: dbadb692605c6f056bf196fcf4a2436a65d20f4fedc783a76c85c82916c63477
font_02_sfnt_off00018d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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