PDF malware analysis — malicious · b88a4dde63756365

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 10:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 6d7d1c0bab04eb3ad44bbba254e557f6 SHA-1: af07dc5a60295bb5c5b77a2ac8a4563bfea96f77 SHA-256: b88a4dde63756365db210f5584e58a38d390395775fa37ac3a446b2763f4609f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=iflirts+apk+mod', suggest a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and numerous external links strongly indicate an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://crysiq.ru/uplcv?utm_term=iflirts+apk+mod PDF link annotation
- http://bradzo-ep.com/uploads/files/27891143696.pdfIn PDF document text
- https://pacpartner.net/images_client/imagesfile/51842365183.pdfIn PDF document text
- http://radis-rrl.ru/userfiles/image/93635669482.pdfIn PDF document text
- http://studiocastigli.eu/userfiles/files/buzubikinebikuvuxu.pdfIn PDF document text
- http://knipia.com/userfiles/file/mifozefalo.pdfIn PDF document text
- https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/uhp0b4dnjbjl9aciv3nlndnann/jujujujufo.pdfIn PDF document text
- http://www.gabrielamaciel.net/images/content/file/48157041435.pdfIn PDF document text
- http://detskaoptika.cz/ckfinder/userfiles/files/63389608220.pdfIn PDF document text
- https://stmpallet.com/ckfinder/userfiles/files/98040749041.pdfIn PDF document text
- http://ifaistos.reality.gr/~triantaf/images/file/94457379800.pdfIn PDF document text
- https://ymvii.com/admin/upload/files/bomesudezolewikujawikeja.pdfIn PDF document text
- https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/88544990038.pdfIn PDF document text
- http://hueide.com/upload/files/696774144.pdfIn PDF document text
- https://giorgiosantinelli.it/file/23990948238.pdfIn PDF document text
- https://aquamedicasatumare.ro/ckfinder/userfiles/files/davumububoro.pdfIn PDF document text
- https://netron.pt/app/webroot/media/files/naxewusanivepixafidisem.pdfIn PDF document text
- http://kaies.cn/upfiles/210916143158487388btgh6v.pdfIn PDF document text
- https://e-room.co/userfiles/file/97348969203.pdfIn PDF document text
- https://lecachet.fr/docs/files/sufenode.pdfIn PDF document text
- https://atlaskvartir.ua/data/uploads/files/42171885356.pdfIn PDF document text
- http://exmar.it/foto_fck/file/jenovamadofofesi.pdfIn PDF document text
- https://euchebnici.com/img/file/32461395852.pdfIn PDF document text
- https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614006c1ea579---gagitewuritunekutinomu.pdfIn PDF document text
- http://gd-weimi.com/upfolder/e/files/20210911235115.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141432d4a6e9---53387627924.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf6ec3f4e3---90387572905.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d655.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD655	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ee67.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE67	18968 bytes
SHA-256: `0e2e062c0e65082e8170081e8812078d4b921e35e04d659a1d0c78ddbb6e0e24`
`font_02_sfnt_off00011fb1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FB1	10464 bytes
SHA-256: `d5e944ec0c8faf454587671a94804bf46e911b4ac2dca4b8484a7c5083a3b33b`

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