PDF malware analysis — malicious · 20549c267a78ad3a

MALICIOUS

PDF

83.7 KB Created: 2021-08-14 07:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: dbb029aeae3ac2bcdab5ef4c4659983f SHA-1: 636d78a8860b0fee5b135d21f85798693e560958 SHA-256: 20549c267a78ad3a636dfd1e32c14b259adb5d4034b63d46a50934512934812d

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites. The document body, though heavily obfuscated, contains elements suggestive of invoice or callback lures, aiming to trick users into clicking embedded malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9983

Heuristics 8

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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=new+england+firearms+pardner+20+gauge+single+shot PDF link annotation
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724a961ec46---xopajemakodopimovo.pdfIn PDF document text
- http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/29213325546.pdfIn PDF document text
- https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab53bab04---32730457258.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae7dec1c06---24384183834.pdfIn PDF document text
- https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/101e825f5ce8cc2ebd281505390a82e3/79894447113.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01390dc8c---bosigasojafimomadanud.pdfIn PDF document text
- http://rauvuonsach.com/images/uploads/files/sanojoxazesibafobopulu.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c0065bf6c---19957651058.pdfIn PDF document text
- https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a50529179a3---30563367402.pdfIn PDF document text
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8a0eeeb23---saforujotalesil.pdfIn PDF document text
- http://better-pharma.com/images/file/files/38396286649.pdfIn PDF document text
- http://hndgyl.com/v15/Upload/file/2021714103244259.pdfIn PDF document text
- https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b632e78a5---95570866439.pdfIn PDF document text
- http://osc-pribor.ru/products_pictures/file/70011535234.pdfIn PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160be38a3b3fc0---22195718951.pdfIn PDF document text
- https://bbgpiti.com/userfiles/files/90737737743.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16077be4d0fb9b---buvobepojamazezuzoset.pdfIn PDF document text
- http://matsonconstruction.net/userfiles/file/94862795048.pdfIn PDF document text
- https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7636ee7e9---48275506949.pdfIn PDF document text
- https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/763dde5a7da4f16440755a8f317fe25b/73267608618.pdfIn PDF document text
- https://dpt-mh.com/uploads/news/files/suwafubebevugeguk.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160864d4550d85---6342979366.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609834da7d0d1---13776867454.pdfIn PDF document text
- http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9b996f4ed---45972663621.pdfIn PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/t6aev77m22s2uqnvqmhopqs0g9/71933039381.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_off0000ddd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDD4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f5e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5E6	17960 bytes
SHA-256: `fe8de1f7af683530f8581e8201acfc1c84485ed3664bdab2e708b7c442c77a46`
`font_02_sfnt_off0001256c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1256C	11352 bytes
SHA-256: `52238ffdf62997b7552369d638412b8886d57f6eeff3b4398ab802de1756494f`

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