PDF malware analysis — malicious · b0ca44b8888f34a3

MALICIOUS

PDF

76.2 KB Created: 2021-08-22 19:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 7036bb7b77ba7eeec34f6e00c6b4fc59 SHA-1: d4726cc385d7223215d5a0a72e7b02a93ae31c36 SHA-256: b0ca44b8888f34a3b877b13926ee76fdd1d07c434da38929342372840abf9b19

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting it's designed to lure users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting the malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=home+decorators+collection+cordless+blinds+installation+instructions PDF link annotation
- https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6e54b1f577f3efabc8cbaf5f200f133a/32718518932.pdfIn PDF document text
- https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/b55cd039011e56c015ec315a7d0c7eb4/biketabirif.pdfIn PDF document text
- https://yarpaket.ru/userfiles/file/vaguwefepifaloweluxi.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4a9049e5a---rewujopamefovinazufobe.pdfIn PDF document text
- https://bahia-group.com/ckfinder/userfiles/files/66723332349.pdfIn PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121838c20c72---32207355940.pdfIn PDF document text
- http://gagutp.com/sa_upload/userfiles/file/20210531082617.pdfIn PDF document text
- https://infotechb2blite.com/bot/ckfinder/uf/files/79500773548.pdfIn PDF document text
- https://unique-u.biz/images/uploads/file/68345051485.pdfIn PDF document text
- http://jpind.pl/userfiles/file/galuvixubeforowage.pdfIn PDF document text
- http://teakdeck.pl/files/file/24268865903.pdfIn PDF document text
- https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae1c0bc44---14959369603.pdfIn PDF document text
- http://gaineyranchaz.com/userimages/49142984343.pdfIn PDF document text
- https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/btavun18003fj4nfoo0udlcmls/53242717487.pdfIn PDF document text
- http://studiotecnicomancini.eu/userfiles/files/47497830226.pdfIn PDF document text
- http://uhy-th.com/image/upload/files/tuzusoxadoxefulosiviviso.pdfIn PDF document text
- http://thietbiotovn.com/Images_upload/files/vegexozediganukugazu.pdfIn PDF document text
- https://dwitunggaljaya.com/sitefiles/file/45469799683.pdfIn PDF document text
- https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/19ca70f4e4377ff7be7ae84a0022b841/fexagi.pdfIn PDF document text
- http://resetimpianti.it/reset/public/file/66335425774.pdfIn PDF document text
- http://www.scsk12.org/policy/files/files/44037953017.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3e4440a78f26c61fb7bb0756efae4c39/28480039802.pdfIn PDF document text
- http://kahasat.cz/data/file/bavamemalonujuli.pdfIn PDF document text
- https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/g0gp7bmujm5rm9b99lsjn07sh9/77951790697.pdfIn PDF document text
- http://exosushi.com/uploads/files/nimolin.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_off0000c53b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC53B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dd4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD4D	17308 bytes
SHA-256: `4004c11b8a7def49655067111a60721d00af09c3735f7e4d8b895d6c14f4b708`
`font_02_sfnt_off00010990.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10990	10760 bytes
SHA-256: `ad0d38d88706c46972191ff8b35e78596de11ded1569d60a35cc1d216429b4f2`

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