PDF malware analysis — malicious · 8a16ed863da2156c

MALICIOUS

PDF

123.1 KB Created: 2021-09-03 02:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 472b9a8f6dd936dbd16bf6436d1b60ca SHA-1: 6810b68ac65e7bd94950907dfb7893732f7f304c SHA-256: 8a16ed863da2156ca56f8146b72d9248febdcfadc0167d0629f89e6f9b7104e7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs that point to compromised WordPress sites and disposable domains. These links are likely used to distribute phishing content or further malware payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9741

Heuristics 6

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.
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://catamma.ru/uplcv?utm_term=the+unforgiven+guitar+tab+pdf PDF link annotation
- https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729c42c55e7---71318047741.pdfIn PDF document text
- https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/2930b4ce77r47dgnq4on2ffadg/23800717501.pdfIn PDF document text
- http://gramercygrand.ru/files/file/lorewexinumupiser.pdfIn PDF document text
- http://casier-a-bouteilles.fr/file/tunowudufu.pdfIn PDF document text
- https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/44db171803021c25234afeaf4bfe7625/8153373584.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b1934b8dd---todovalodibekipote.pdfIn PDF document text
- http://kibbkw.com/uploads/file/gunadavitudawatubisanuzuf.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb76188dab7---waxojigojemimarenazu.pdfIn PDF document text
- https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/879a1368b6ab8a6373b46404efcd6d21/powipu.pdfIn PDF document text
- http://abwingsjanaf.com/uploads/files/migifubabibejifirewekadib.pdfIn PDF document text
- http://luchetti.it/userfiles/files/6634285963.pdfIn PDF document text
- https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/q0022ejcnj88u5fumbmj70r2ef/sobusaxavibosokejitekuful.pdfIn PDF document text
- https://qfse.co/images/uploaded_files/ckfinder/files/1627896395_4fa742e5e0.pdfIn PDF document text
- https://nsck-cykelmotion.dk/userfiles/file/weriko.pdfIn PDF document text
- http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/477b77eb79e7c058ad76ab7f7d9502d4/zikadivazewuduxetelojon.pdfIn PDF document text
- https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775d0660860---16531817319.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4c8880736---pewozadanifotegukamesimo.pdfIn PDF document text
- https://weyergans-hcc.lv/userfiles/file/97935077053.pdfIn PDF document text
- http://dj-venci.com/uploads/pages/files/gorineseviposuw.pdfIn PDF document text
- https://asi-filter.pl/files/file/nobekapixigiloludukeratav.pdfIn PDF document text
- https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a8a9a3dd1eb932adae285a09db0324a/sarikuki.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m8c4pktsb26qa489nrc1f17egm/giwulisoledisowegi.pdfIn PDF document text
- http://espokebar.com/uploads/files/mujutidujafojefe.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ie9ojea3f75l4hi5qf6j8qq490/vaxopuvaziwonumedu.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a662c51bc3e---25572295030.pdfIn PDF document text
- http://55pluscommunityspecialist.com/userfiles/files/3900087476.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00017418.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17418	18456 bytes
SHA-256: `49e6ae2d28c2f79061d3bb9796828f4b067a6e6785368f2655e71f590e0c2138`
`font_01_sfnt_off0001a4f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A4F7	1780 bytes
SHA-256: `4c4e05c3748616fcfda040a33f5ce204dcdeb0c8b987bb37365567758a5c040e`
`font_02_sfnt_off0001ad62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1AD62	10832 bytes
SHA-256: `8c2e711cc1a5a37745811ae83a15eae0a108b8ddb205416233e82a167cbe6b0c`
`font_03_sfnt_off0001c5e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1C5E2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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