Malicious PDF — malware analysis report

Static analysis result for SHA-256 721b075c3dfc6e42…

MALICIOUS

PDF

76.9 KB Created: 2021-09-21 03:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e05138c2cb3feaf9f73056a258d413fa SHA-1: 5dba9354a8426048f6a980ac23183a5baf36df33 SHA-256: 721b075c3dfc6e423b74bfb5b8d096b82912ddf3abe567112dc225562c3f7714
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'SE_QR_LURE' indicates the document may instruct users to scan a QR code, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://drafthe.ru/uplcv?utm_term=scan+qr+code+from+photo+album+ipad PDF link annotation
    • https://charteriraq.ir/basefile/charteriraqir/files/vumobekalofalusul.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/24639178429.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/20024079007.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/tezoro.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/15432190876.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb9bc1fffb---vikokemopokovo.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/47620664773.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3b014dcff06d4f0f78992f5ad4ccfd4a/28565860368.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/vidalaneseror.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-08/images/files/74831600267.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/97e064d88d63642f230524849b2a5fe1/visabagogegofajo.pdfIn PDF document text
    • https://portoggitter.no/content/files/userfiles/file///zogijakaduzasapamoko.pdfIn PDF document text
    • http://alkanboya.com/files/file///pimutemoduse.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/60054709937.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/pezotevu.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/22114594516.pdfIn PDF document text
    • https://drlanda.hu/user/file/90051208926.pdfIn PDF document text
    • http://tlcjty.cn/userfiles/aa/file///9924816224.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/63873116095.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/nigima.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/jikukobas.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/kovigugi.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/31019607927.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_off0000c72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72B 11180 bytes
SHA-256: 1a4f92c4c79b351f281fd6078513360f227195b44e8d6f959b0ce47049766bc5
font_01_sfnt_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 17556 bytes
SHA-256: 7e3f3d59435455be2bc8f68b9f2dce17f8dc762c9a84dbd13dbab8e82a45ddd3

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