Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a395a113c7e1481…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 05:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 44959babf16b606edbaf2ee823d8ed5b SHA-1: e6d9fc2b2e1d1b582f09da0bb01f3b7e8f08a071 SHA-256: 5a395a113c7e148107cd5a8eadceda7c93e8851abe07a870ea349714517520fb
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. The heuristics suggest it functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to host malicious content or facilitate further exploitation. The 'SE_CALLBACK_LURE' heuristic specifically points to a pattern of tricking users into calling a phone number, consistent with tech support scams or fraudulent billing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://huntic.ru/uplcv?utm_term=android+tv+os+9 PDF link annotation
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/ripojuvufamagizorijimawew.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/wejawajefekekewezu.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/gupolezinaregelenadexelub.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/dijoxebabo.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/3368320962.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/13885417605.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/h22vq42tcl1fn489e3qqgidqq5/89437619072.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/mufositowarozebe.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/73019858845.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/meragudanofenuginejad.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e3e61882010dfa3f32b747304a927149/65592699187.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/91421068311.pdfIn PDF document text
    • http://fnathservices.com/upload/file/4092933698.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/63574435047.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dikivadalukotomolopil.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/35273984195.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/tozuvamusoxadisukakefadef.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161445a4f713de---bekazojo.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/78870113345.pdfIn PDF document text
    • https://invest.pl/userfiles/file/31219145632.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/2d97a6aa774a46a91b899bf062a60091/68384509586.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/68907378194.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/rekokobebibugesidigorozor.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_off0000d46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46A 17736 bytes
SHA-256: 6f31cac13140508bcb3f9201a29dbc5a09428258106dda215f920cc50cf578de
font_01_sfnt_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 10116 bytes
SHA-256: 0624eda3a89d58f71d6811ddf8575a9103c151cf64c22bd67d315a16bfb888fd
font_02_sfnt_off00011937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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