Malicious PDF — malware analysis report

Static analysis result for SHA-256 885bbdf178481131…

MALICIOUS

PDF

75.0 KB Created: 2021-09-22 23:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e127a103f302b8a466905b96e36066a SHA-1: efef449bbba3ad9957118a42d27f311e18b84fba SHA-256: 885bbdf178481131e69aa9304f14e72e9a3461b7e6f891d6a0369979084cfbd8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to lure users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=farming+simulator+18+money+hack
    • http://bushurov.ru/images/files/ludurixuboluvebukuribuj.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161469b4139de9---lemepulazalizoba.pdf
    • https://dodatnojamstvo.com/userfiles/file/bepotonib.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/3c6gsh3pcdfmaoi153jokcp7b3/jizaxix.pdf
    • http://sjhtractor.com/d/files/tidugutoboposepariri.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431a7fc34c2---9712136841.pdf
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/zixufazogorizekowivaxega.pdf
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vopinerumegon.pdf
    • http://rehahomecare.com/upload/editor/files/34463677768.pdf
    • https://quangcaowebsite.xemlaco.com/uploads/files/68479234738.pdf
    • https://efsanepin.com/calisma2/files/uploads/3083818600.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/085e26b9ae4153d4531e32fae234aecc/81831612521.pdf
    • https://keralahappyjourney.com/ckfinder/userfiles/files/xitodukojagaseveku.pdf
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/juduwonisigatoxuxeniwub.pdf
    • http://smartickgroup.com/userfiles/30488586354.pdf
    • http://bouwbedrijfbouwheer.nl/userfiles/file/82999571429.pdf
    • http://zhizhencn.com/filespath/files/20210902061750.pdf
    • http://erfansari.ir/ckeditor/files/files/77365649454.pdf
    • http://jsqnchem.com/upload/files/wopisokomepajizalomosuxi.pdf
    • https://sproname.com/files/userfiles/files/60508184296.pdf
    • http://tnshoppingbag.com/upfiles/file/jijowuxofuma.pdf
    • http://www.schule.havonix.com/ckfinder/userfiles/files/28472910469.pdf
    • http://tageedesign.com/ssmpt/documents/file/ravoroge.pdf
    • https://mkserwis.pl/userfiles/file/ketekupamefomapajotov.pdf
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/92179373294.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f782ef8187258fa6784ddaf854e99e55/51044931452.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfea.bin
92fc2b6f7d0577c3c630280dc7b8a17e1228278fe44c2c365fa5b8d93a8c0a96
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEA 11220 bytes
font_01_sfnt_off0000da17.bin
30bfbd5e169717a6b2ce81640fd8d4a00fc79a33dbbe86ec06ef5d3113a9a18d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 17032 bytes
font_02_sfnt_off00010643.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10643 16792 bytes