PDF malware analysis — malicious · a76ab01ac87fef2c

MALICIOUS

PDF

82.7 KB Created: 2021-07-04 05:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: f77fe6e33d5675f9e8525ab3a6c79bae SHA-1: 07934071276748043dab02c4c6b45efcb8d28669 SHA-256: a76ab01ac87fef2ccfd37d449d6588a0393f34532a6c0e6ab3de33f213172004

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, leveraging the 'Spearphishing Attachment' technique. No scripts were extracted, but the structure suggests a malicious document designed to redirect users to harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://huntic.ru/uplcv?utm_term=where+do+i+find+my+blocked+contacts PDF link annotation
- https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/52a96336a2eeb374798297a0ea063b70/zinerejarizerukopewaf.pdfIn PDF document text
- https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6cfef657bb4d8e6f39b54a79fdf22336/64495782024.pdfIn PDF document text
- https://menlopark.com/wysiwygfiles/file/mowezupev.pdfIn PDF document text
- http://wsp.pl/userfiles/file/40433804482.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5183e6470---12866906897.pdfIn PDF document text
- http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608580da590e1---88003789551.pdfIn PDF document text
- http://naphotelbangkok.com/userfiles/files/71840398003.pdfIn PDF document text
- http://www.alexgis.com/siteuploads/editorimg/file/komupoko.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/d804knhf86o74mvcelnql7n1of/lozib.pdfIn PDF document text
- https://mdteam.se/ckfinder/userfiles/files/xufuxanotezadosi.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607660824ab02---22538217876.pdfIn PDF document text
- https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/qq5b0713cnsmd0ssflvhvm5u94/wobiv.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794b6c29f2b---83380346226.pdfIn PDF document text
- https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/boapt6dq5admu0uuv32rm8cv77/bizobizoxoremovapo.pdfIn PDF document text
- https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/debf8937f97aa347c97248d574712791/kowufubafusiz.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad3747febd---52565854695.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a59282cde92---dusulisamowiwena.pdfIn PDF document text
- http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607724d2bfdee---rixeso.pdfIn PDF document text
- http://wallawallahighschool1968.org/clients/75819/File/redigamosogusig.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d886ef266a---97751013652.pdfIn PDF document text
- http://bangkoksolarpower.com/syner_upload/images/files/narenelubuxidedesekiw.pdfIn PDF document text
- https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a19d73c3aa85cf0b8926fce3836b3674/23877791824.pdfIn PDF document text
- http://ebslang.net/_UploadFile/Images/file/wiguzaposog.pdfIn PDF document text
- http://studiotecnicoarduini.eu/userfiles/files/74232913668.pdfIn PDF document text
- http://kubabus.cz/novy-web/upload/file/13737848133.pdfIn PDF document text
- http://duetsepolno.pl/userfiles/file/84037015797.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_off0000df4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF4D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f764.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF764	11080 bytes
SHA-256: `6de6dec3a64031c266bd16657f09a4f83248f7d2a2833b3da0433a9194848e8d`
`font_02_sfnt_off0001110b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1110B	16928 bytes
SHA-256: `deccef5debd90892b38cecd80fd5bb8b1d92d2e94b0858283dfdf34d3d777007`

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