PDF malware analysis — malicious · 273e1f59ba55f62c

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 17:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: afd9853cae45e153fa21eabf759c0306 SHA-1: 6f3f1b0fdda11b1ffdea638f11b38d3f1157709c SHA-256: 273e1f59ba55f62cb3c25a07a4b1fa02e2b78c40bdcd0ac1d271203025d47c16

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The primary attack pattern appears to be directing users to potentially malicious content through these links, leveraging the document as a lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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 http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb05b6d1dc7---49038693432.pdf In PDF document text
- https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/a8ac450517a3de25bf173b6ce7c728ca/96972015.pdfIn PDF document text
- https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/68c45fe03ecd886947b08c0163cc280f/rufamometadig.pdfIn PDF document text
- https://krone-murten.ch/userfiles/files/3189888107.pdfIn PDF document text
- https://karapinarinsaat.net/userfiles/upload/file/60186802169.pdfIn PDF document text
- https://drsoleimani.ir/userfiles/file/govagoxe.pdfIn PDF document text
- https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf405dab5---41968593319.pdfIn PDF document text
- http://tomlitkom.ru/ckfinder/userfiles/files/jevepum.pdfIn PDF document text
- https://fnb-concepts.com/images/uploads/files/97590866617.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160987286ae0bb---nideja.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f9c7a782775a6d9c6f3a09e28d65e6a4/9613567052.pdfIn PDF document text
- http://whatdwellswithin.com/file/lidubako.pdfIn PDF document text
- https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f5b94c5919d239ce08fa98584b45d964/xabafuvenezanawiponek.pdfIn PDF document text
- http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16117e93c70075---66839305938.pdfIn PDF document text
- https://ienter.bg/files/63958720081.pdfIn PDF document text
- http://stnicholasway.com/userfiles/file/4152570279.pdfIn PDF document text
- http://kleinschadenexperte.de/userfiles/file/380486690.pdfIn PDF document text
- http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42ff68a7ba---1587871074.pdfIn PDF document text
- http://chatfieldfarms101.com/userimages/wofabe.pdfIn PDF document text
- https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/bcfe020e0fe8248aefeffecc18edb88f/16467472495.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce16c76d0c---kavafutafirolupaguxusu.pdfIn PDF document text
- http://hi-techfiber.com/userfiles/file/20723519998.pdfIn PDF document text
- http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/2ccrfhdj85b4j202j6m83v1953/58820847864.pdfIn PDF document text
- http://soloparamideco.com/js/new/fckeditor/userfiles/file/wilekuwe.pdfIn PDF document text
- https://festival.bg/fckeditorfiles/file/zisulexodudofekubimur.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pfaff+463+sewing+machine+repair+manualPDF link annotation
- 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_off0000cf73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF73	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e78a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE78A	11312 bytes
SHA-256: `9036b375142deed54cec10e27a0d8f9d1faff9e894dd5dbeb9b67a9e68c47328`
`font_02_sfnt_off00010200.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10200	16720 bytes
SHA-256: `9f906b8b5e3f076ae1d8eadb0c24d6eca5a810895d1fa31f7b25dec9dc261380`

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