Malicious PDF — malware analysis report

Static analysis result for SHA-256 6532fca4d8aab18b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 16:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a59ec45799a8f3262e4b9e1b3883e04b SHA-1: 332bd6731486379ed8ca24d490022394e2f01933 SHA-256: 6532fca4d8aab18b240604bd6c13a1d0af09985062023af54eb73f40b2a236df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised or disposable domains. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=power+of+android PDF link annotation
    • https://299-45.com/CKEdit/upload/files/lijozi.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210909_27D7350BD1FE1ED4.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed74c04a4b---92654016972.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/xelimajeneteridutibidigo.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/13158475738.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/23848839683.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/9857284067.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/betixodexajopomarakokogaw.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/gujizusunibirijujip.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6a52215dfb8848a3e2606bd83544310f/pobupozawikogamirugovijak.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/34351630416.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/93321522474.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/34748571106.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/tobosur.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/tudovilelorawopumomu.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/45221807099.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/67057972201.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/73830660873.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/pufosedibuzuwirefuburogu.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/34889725620.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/sibusupekomok.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c954259cf5f1bad3ccf5f255a97dbfe8/rimekaponorovimesewemasu.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/bipelonep.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jagejuro.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_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 10124 bytes
SHA-256: 91257802129ee940491c98b57a3e35a2140ff46ad7b0c04db6ff8610d2bede59
font_01_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 17736 bytes
SHA-256: 35a4f834693f9abb59a25bc8dbee10f493570871091a217c8b1e1b5921807554
font_02_sfnt_off00011ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1