PDF malware analysis — malicious · 5795fd525625d104

MALICIOUS

PDF

91.5 KB Created: 2021-06-28 08:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 745658c032dbde6a4dcd84d46300fd92 SHA-1: 9eca4cc146e921baccd1114a78d4443719161493 SHA-256: 5795fd525625d1045170f9ac6f66e3f4adf807a0dad2b7aa9e88fe26a5688f51

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=free+printable+metric+system+chart PDF link annotation
- https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711b33bec5b---darotojilofowunovab.pdfIn PDF document text
- https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0094a36389573824435b11137f68addd/webovoxerunosukaxutulub.pdfIn PDF document text
- http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/def0a0c73a97e070fd9fbb3f6a03e272/vinusidi.pdfIn PDF document text
- https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/chmjsd80sfrvcddeubmipbkpvg/rewitokalaromev.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a1b57c6a---towunolefozapaz.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d6a06f7e59f1c832a74958e8eedb806f/detudowotegem.pdfIn PDF document text
- https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/1bh3ej5e5dnd56bmk9ol0dogul/12615395933.pdfIn PDF document text
- https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b60c22e9a20c0fa6dab0edd680c2d6bf/nonujani.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607593da79a9b---12886738573.pdfIn PDF document text
- http://wamer.org/userfiles/file/44488834151.pdfIn PDF document text
- http://minhvuongthuphap.com/upload/ck/files/81007448624.pdfIn PDF document text
- https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160718d6d6c177---52328510822.pdfIn PDF document text
- http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608832d09aa5f---novubibo.pdfIn PDF document text
- https://easy2ticket.com/upload/files/45758613006.pdfIn PDF document text
- https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d33120f1---patewibove.pdfIn PDF document text
- https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/cj40931llkeig1mmmqov5f0jo0/68517226134.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d415f138e9---jiwudonujijifedem.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/nes2a8qe5tkg2lru1mb9dppn2s/gogonirovojofi.pdfIn PDF document text
- https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/ef3f7c70742749114624c07cd5fa3196/51619963708.pdfIn PDF document text
- https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d09d7f5ea7e6f0e0e9dad889e575f22b/60352070596.pdfIn PDF document text
- https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/09be9a0f6743f6bd7daec1eaf915d361/31429618129.pdfIn PDF document text
- http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081dbc6d3019---pejalu.pdfIn PDF document text
- http://gancza.pl/userfiles/file/jutejimavokexurexope.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160797a646052e---furukaginetekid.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fa66d8b40---53706311777.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_off0000ffc9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFC9	10748 bytes
SHA-256: `3661a0184184e2a8e2e4324cb0b83364401bfbcb170c7e0b3d1db38cd534cbf0`
`font_01_sfnt_off0001180f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1180F	17904 bytes
SHA-256: `2b76e477a3a34fcf93c4d017d5b420419fc249f12193a8ba058c43ac95f40c94`
`font_02_sfnt_off000146b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x146B0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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