Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d785f033cac046c…

MALICIOUS

PDF

87.8 KB Created: 2021-09-13 01:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a4f54fb7e8bae626774934c0c445f3d SHA-1: a6bb1653f82fb4797271fe92fe9d3c02efd263e8 SHA-256: 9d785f033cac046c46cb776221ea1ce0356e3653fc54575495934ddbe00d54a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://wastran.ru/uplcv?utm_term=the+untethered+soul+pdf+drive PDF link annotation
    • https://castilloexterior.org/ckfinder/userfiles/files/rijug.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/dca7bc4f9fc2f98222f685bb6396d6bd/ponupupimimasafuzowi.pdfIn PDF document text
    • https://ntc-container.com/upload/files/4639631180.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/jozafetivevika.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/jolotosozofanefusawo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132cfd26fed1---davuvijufigusoxowego.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/28515018816.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/dezememukujubir.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/54768919400.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e89113aa---83179325362.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/sokitigolalodedonuf.pdfIn PDF document text
    • http://wdnederland.nl/file/zapizukoxijozofujamireki.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132102cf153d---81448900108.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/lumesus.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/73420087860.pdfIn PDF document text
    • http://gaudi.tw/upload/file/34762877834.pdfIn PDF document text
    • http://darstin.com/userfiles/files/gixalavozokiwetamigegusi.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/mukozanetovozuvoj.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/79616268806.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/woxozebevi.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/wajizugodopufenaxoverin.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/87771183726.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/jogujo.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/36790594697.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/26975543279.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/fabagebizokalepo.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_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 19508 bytes
SHA-256: 1bb947d98fd8f5bb2a35c3820271436275622ddfb5267eb88325acc44e5b4451
font_02_sfnt_off0001396b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396B 10560 bytes
SHA-256: 4308c30a08a84bc9a31e9c812140dbc5b0ccbafac20a484180a4af554cd31338