PDF malware analysis — malicious · db8c6bfaa79c6b32

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 07:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 00bf9416ef5918335ccdf6221cd36074 SHA-1: 88df329ce662f3deb20109fa2daebc6e9a026922 SHA-256: db8c6bfaa79c6b327a074b1fb20504e9d9bd08b437addc712fdcbc308a45b3dc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The presence of external URI firings and the ML classification strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=cemu+emulator+apk+android PDF link annotation
- http://rentator.com/uploades/fckeditorfile/rumaxatizevu.pdfIn PDF document text
- http://upasamed.org/Content/uploads/files/96625530171.pdfIn PDF document text
- https://permargi.com/files/galeria/files/xibezifinipure.pdfIn PDF document text
- http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/dizerunitiwijosofawiv.pdfIn PDF document text
- http://wronba.com/uploads/wysiwyg/file/84432623085.pdfIn PDF document text
- https://basalyemek.com/ckfinder/userfiles/files/vepokorilesagov.pdfIn PDF document text
- http://phucuongplus.com/upload/files/44217751045.pdfIn PDF document text
- https://shibbirs.com/media/files/43007640964.pdfIn PDF document text
- https://zhbiotech.com/CKEdit/upload/files/45577594932.pdfIn PDF document text
- https://anakmeong.com/contents/files/59431358483.pdfIn PDF document text
- http://lex.tj/img/file/gawol.pdfIn PDF document text
- http://www.rsvpcatering-ar.com/files/imagesfile/weguzog.pdfIn PDF document text
- https://siliconautomation.com/userfiles/file/50924930707.pdfIn PDF document text
- https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/63835199358.pdfIn PDF document text
- https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6a1cc24dfa2c2f83f480513f864ef8cb/12579223001.pdfIn PDF document text
- http://doggystylzgrooming.com/admin/photos/file/59683755973.pdfIn PDF document text
- http://arcomproltd.com/userfiles/file/turasagiriv.pdfIn PDF document text
- http://thewellmanteam.com/userfiles/files/10259504146.pdfIn PDF document text
- https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/babca91e091e566391ae5e54d0916484/71342901353.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a36746aa9cfb8fa88ad4e00dec13873a/jovarebovoxufuxepe.pdfIn PDF document text
- https://kultmotor.hu/images/files/18614273186.pdfIn PDF document text
- http://cyc.cz/pictures/clanky/files/30018918724.pdfIn PDF document text
- https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/0635493cd349197f4c9e153d19059459/sovoletu.pdfIn PDF document text
- http://metabolit-plus.ru/files/file/2945002501.pdfIn PDF document text
- https://mlbcsimleague.com/ckfinder/userfiles/files/zilinizewivikosigu.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_off0000b663.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB663	16736 bytes
SHA-256: `0c6aa571f4ae1e6b6cd50b03d2b2afffc5528b3b03a16da653f1a6ec6156a908`
`font_01_sfnt_off0000e0ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0AD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f8c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8C4	10608 bytes
SHA-256: `1845d882fc48dace503a65b5ccc9bf789af97fb8d1cea71f1ab6983a90be9fe7`

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