PDF malware analysis — malicious · b1cdc88e37a836f4

MALICIOUS

PDF

88.0 KB Created: 2021-07-15 14:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 406908bc12d104860ec0b6ad0070fcef SHA-1: e92fcfd4f2870052b92f0301adfe6d38fb3e4564 SHA-256: b1cdc88e37a836f4cdc6a3718746890cda3340c44b4eb91bd1d1ae44578bdf10

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and link farms suggests an attempt to lure users to phishing sites or download further malware.

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://krisoc.ru/uplcv?utm_term=most+three+pointers PDF link annotation
- http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160764a5150623---wugirufotovole.pdfIn PDF document text
- https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a815ea4e667e8bf78b4bce6b37774522/62747057021.pdfIn PDF document text
- http://tatugigo.com/ckfinder/userfiles/files/29345965985.pdfIn PDF document text
- http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0afb0166d---19280349004.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc50c610773---zuligenutilebonofepag.pdfIn PDF document text
- http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/kefagexu.pdfIn PDF document text
- https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/42igikma8irt6idg2svjepc0t4/kilipanok.pdfIn PDF document text
- https://implant-drill.com/userfiles/file/xosatunozubin.pdfIn PDF document text
- http://koszyczarek.pl/userfiles/file/zewevomifizewoxiguno.pdfIn PDF document text
- http://happyland-nsk.net/ckfinder/userfiles/files/83525944260.pdfIn PDF document text
- https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/153c5efab0cf3c27ffcf4ab1667e8c3c/39836245527.pdfIn PDF document text
- https://alternatifhirdavat.com/upload/ckfinder/files/50715093290.pdfIn PDF document text
- http://infrabud.eu/fckpliki/file/32533239045.pdfIn PDF document text
- https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/608651a80d56f0e208bbf86679c4163e/13774615562.pdfIn PDF document text
- https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c2b60140---20709704949.pdfIn PDF document text
- http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f46efa1d7e---22764524996.pdfIn PDF document text
- http://aksaaydinlatma.com/img/editor/image/file/78379741185.pdfIn PDF document text
- http://sacoorhealth.pt/site/upload/file/fiwamifenugusegi.pdfIn PDF document text
- https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/iquu5e6cn179vc53s8o3288ram/wakexo.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f59193ca8---wodominibevi.pdfIn PDF document text
- http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/jamerasirizonakezep.pdfIn PDF document text
- http://omgmediatank.com/userfiles/files/23488945014.pdfIn PDF document text
- https://ltssinternational.com/res/wysiwyg/file/tapotazoralirupapuwilud.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1bd79301---42596823806.pdfIn PDF document text
- https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/7a2cca4da91063e51bea69893329a82f/15729327867.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_off0000f44c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF44C	10136 bytes
SHA-256: `b054a1435b1a364a54f06a9709c84f7140b09e04f76af1aa4f5a9c22c266826f`
`font_01_sfnt_off00010adc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10ADC	17960 bytes
SHA-256: `abacf68aaa806bf0fa403e221bc08892b0b4569309c17c083e7f8a2fa7b579af`
`font_02_sfnt_off0001398a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1398A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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