PDF malware analysis — malicious · 9a9e77f0d89e3b92

MALICIOUS

PDF

74.5 KB Created: 2021-08-09 20:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 974dd15a95ca5354271a0613c580976a SHA-1: 14afd46f97f322e2be142c7b5e1d6d1a09d65923 SHA-256: 9a9e77f0d89e3b92e51cc14910c436fd8d216f13925fb332296db4aef60c4f49

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The primary URL, 'https://coretry.ru/uplcv?utm_term=universal+remote+lm+1079+programming+codes', suggests a potential phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9907

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://coretry.ru/uplcv?utm_term=universal+remote+lm+1079+programming+codes PDF link annotation
- http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b80a95f6cb---woduben.pdfIn PDF document text
- http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/ninuzonuxibasutokeno.pdfIn PDF document text
- http://cp-1.ru/userfiles/files/49002470642.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607890a50d6d9---xipili.pdfIn PDF document text
- https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/kofp9aq89dqbpku3ceq77bh428/21361730685.pdfIn PDF document text
- http://mosjob.ru/images/file/sufonitarojisukilade.pdfIn PDF document text
- http://antoniolescio.net/userfiles/files/nuwaxiralodataf.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13fa2e4eee---momap.pdfIn PDF document text
- http://podlahypilat.cz/admin/file/malasokulaxogi.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f41d6262f19e1164943ceb59ff7d94fd/mawivofo.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c652ffe4f1d---58432595307.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/207abaaec33379ff9bf98840f3ddd185/8712864727.pdfIn PDF document text
- https://nguoixunghekiev.vn/userfiles/file/tixumasilebo.pdfIn PDF document text
- https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/d8693f56f29f1a5ea5d4bea6f6d2a2c2/dilos.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/58f3c9045921cc13bd3298d4462e7b67/titedotaxidis.pdfIn PDF document text
- https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5495d8f9d5b1d7cdaadd7ada808143e7/35587943848.pdfIn PDF document text
- https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/5db6df2a4238dcdb75d59bc963302793/menizata.pdfIn PDF document text
- https://kocarbonag.com/luutru/files/nobefogubogilazoga.pdfIn PDF document text
- http://meble-tk.pl/userfiles/file/68300146317.pdfIn PDF document text
- http://teusz.pl/UserFiles/file/sezefimipoxafupaj.pdfIn PDF document text
- http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/1888973420.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa692365b7---36002988562.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fc6a941087a208655917ea4a25ac4821/zadodejowebop.pdfIn PDF document text
- https://syteq-pro.com/userfiles/file/41153009591.pdfIn PDF document text
- http://rayanchem.com/d/files/pinomim.pdfIn PDF document text
- http://hzbmsj.net/images/upload/File/48568656961.pdfIn PDF document text
- https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/8017644592.pdfIn PDF document text
- http://jjinline.org/file_upload/file/82008824858.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_off0000c020.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC020	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d832.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD832	16152 bytes
SHA-256: `85793d181fb46746980bfb6e2728b5ee4b4272eec6c103ddc4ed601832c48353`
`font_02_sfnt_off00010155.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10155	11324 bytes
SHA-256: `339589d15e6554af0bdf0710bf20b212cab42d7231351ebce3f9bcc6ccc8e127`

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