Malicious PDF — malware analysis report

Static analysis result for SHA-256 03094c286b51e26f…

MALICIOUS

PDF

96.5 KB Created: 2021-07-29 18:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f5b2df520b07f8fe334e04b4b790a7c0 SHA-1: 1fb1c72b97d910800e3757ab49033504083414de SHA-256: 03094c286b51e26fff1fa2077040e712f5d4087649b8490f70c520e3ad8ec8df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites, disguised as a free download. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900da6e007a---nipugonimigujagilaj.pdf In PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/d2daf3ae0f1d0c7f55615d9a5b18c6e2/13424640012.pdfIn PDF document text
    • https://buka.ru/sadm_files/58357274181.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/lifivapopif.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/2631034547.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/25169287692.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608551c46bbde---79553564469.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/temuwapuvinoletazigedej.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9b24be1c1---wifodeganitudibiravip.pdfIn PDF document text
    • https://unosms.us/userfiles/file/55089928795.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/fovunofozatoxelexiwupawa.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e699680ca---samagixafak.pdfIn PDF document text
    • http://thedreams.cz/files/60498042599.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4dfead65e4af95dc0176b3b04093cd1f/sujesudepofazovubadevu.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/26fb7e8f2a80fd67ed68f0faedb83a10/wasemunuro.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3a04724e1---nobebubibata.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3ab37e591117fd114f111e81bdd76bd2/72770240719.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/4e965f66bf07b3bdb181a89b29420e2b/47234603348.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/cc31013cd72826f2455e90fb9452c81e/32439860858.pdfIn PDF document text
    • https://latework.cz/soubory/59565480641.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/dusepewezukotazuvosaje.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/71326163569.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/11092603669.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/65149065292.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f622353a5ff---gobatibifanexavikasosik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=free+download+background+music+for+video+editingPDF 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_off00011257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6E 11280 bytes
SHA-256: 4ca3f60e6c0261cd60df6b217093548af2605c3ee6f2130646ed88671b28dbfc
font_02_sfnt_off000144c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C0 17856 bytes
SHA-256: 6b27d7da8988fbb615d31c4b450af7eb0ced94927935d13323450377e8e3c170

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