Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f604b7bb222887f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 08:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 720db1184c0a6d31b89cfd9d9ade043c SHA-1: 3b7f0503801ec337464f1a2d2b542bfd48deb073 SHA-256: 1f604b7bb222887fdd2ba7a1a290a17c90fd97e8decb6e441e2a8e82ed74f25f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be redirecting users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=it+chapter+2+watch+online+free+now PDF link annotation
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8533e266d8e88e7aa41c40097f78223f/velixadawutelotujodexa.pdfIn PDF document text
    • http://erimti.com/userfiles/file/kawizegejireguronumeju.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/47926751080.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/22054639738.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/45712348456.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109061108286941.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/95971627731.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ae4d6a9cee32ec0226a8641cfa2bd5bc/dekukovowexujawefosiketas.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/vuxojataza.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/93587397777.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/4p0a3uh7ohgrqjtko55aqeig7q/43390285310.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/rizilo.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/nagud.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gewikotavi.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/61579748105.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/kenizib.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/zipasokogofu.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/12899650828.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/54863110453.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/visogek.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/32917957433.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/reseg.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/21642860191.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_off0000d5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 17988 bytes
SHA-256: b9475ea6cd49eaec56703b065f8cca9000710632f3883f4b4cc852fcbcfc02c3
font_02_sfnt_off00011c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C61 10564 bytes
SHA-256: be83735daf67ff22743444dda8c064bea5cbcd059ea687f0095319067de93710