PDF malware analysis — malicious · 4fda3ecbc11dedb0

MALICIOUS

PDF

87.5 KB Created: 2021-09-07 16:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 52de288db4e59f3443a19938ba01e46d SHA-1: 705c3ec4e4396419751c6806d496ef531b3c2ae1 SHA-256: 4fda3ecbc11dedb03038eda377a779b33afed3d02984c4fc7faf79c6d76a9085

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leveraging embedded JavaScript for redirection.

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://philabc.ru/uplcv?utm_term=jetstream+4k+ultra+hd+android+tv+box+manual PDF link annotation
- http://citra.cl/userfiles/file/66112142356.pdfIn PDF document text
- https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/tj839ns2foal79or696qt94sh5/mirume.pdfIn PDF document text
- http://pc75.net/upfiles/file/1622264384.pdfIn PDF document text
- https://moveo-sport.pl/userfiles/file/60041949556.pdfIn PDF document text
- https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/65b20c5a951a1a7130f7af90134d289e/miwiwoxi.pdfIn PDF document text
- https://tekstilkentrehber.com/upload/ckfinder/files/17269498885.pdfIn PDF document text
- http://grupopiscis.com/upload/files/gerapubum.pdfIn PDF document text
- http://matras-devison.ru/upload/file/lizedolig.pdfIn PDF document text
- http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/wipofidetiwojex.pdfIn PDF document text
- https://mk-promotions.com/ckfinder/userfiles/files/82964488890.pdfIn PDF document text
- https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bbae97649943bfcb3ad3266b0289355f/24951057292.pdfIn PDF document text
- http://travelshops.pl/userfiles/file/pivefagaganiset.pdfIn PDF document text
- https://savitravel.ro/ckfinder/userfiles/files/waneja.pdfIn PDF document text
- http://epsilonsigorta.com/files/jafifajifobefusomij.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16083c25f24fea---65519697661.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4b46ad4fb---pasoxabokaxafebolodakok.pdfIn PDF document text
- https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5fd1ec969a38d620c4d5a95927ffd2b1/16013838562.pdfIn PDF document text
- https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c64c16ad05a5b622c156a6b1b951ca0/52730581367.pdfIn PDF document text
- http://esenkardeslerinsaat.com/resimlerfiles/xubodepelin.pdfIn PDF document text
- https://praktijkbinnenstad.nl/file/kidixowonowil.pdfIn PDF document text
- http://abogarestudio.com/userfiles/file/ximuwuzutu.pdfIn PDF document text
- https://publicbridge.pl/userfiles/file/89835413871.pdfIn PDF document text
- http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90fb8706a---85900804185.pdfIn PDF document text
- http://ingenermarket.ru/userfiles/pimamajixozisiregexewunig.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_off0000eb34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB34	18852 bytes
SHA-256: `a450061919bdd561614cc343b7f76210273dd09ee54253ee60895f69c7acd440`
`font_01_sfnt_off00011c8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C8F	11080 bytes
SHA-256: `4255b48d4faf623c2a041065f599bbb83e3782d10aa4ac8fa15532674dda3b6d`
`font_02_sfnt_off00013642.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13642	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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