PDF malware analysis — malicious · f6837de2f5e401b3

MALICIOUS

PDF

69.6 KB Created: 2021-10-01 00:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 9c309a3914a8bc94940bfd22633d1c06 SHA-1: 3f0607810d992627f8e9f75ff5a69d6b61266fe8 SHA-256: f6837de2f5e401b3f11675bb55f369baa1a69a58de765f03b7e9ec375c08015c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or spam campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=live+tv+without+internet+apk PDF link annotation
- http://dhalahoredeals.com/survey/userfiles/files/12268703889.pdfIn PDF document text
- https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151864630c78---38021812593.pdfIn PDF document text
- http://thewesternmist.com/userfiles/file/wunokepizaxilumomep.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383461230d6---65884795506.pdfIn PDF document text
- http://geojeoceanhotel.com/userfiles/file/20210905000623.pdfIn PDF document text
- http://luxmeterthai.com/ckfinder/userfiles/files/31781953035.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16136bd934943b---67199564442.pdfIn PDF document text
- https://testpensija.bankai.lv/ckfinder/userfiles/files/76760745548.pdfIn PDF document text
- http://progfin.pl/userfiles/file/46762149212.pdfIn PDF document text
- https://martensmgt.com/business_school/uploads/file/43224462663.pdfIn PDF document text
- https://lose-weight.tw/upload/files/pakejunet.pdfIn PDF document text
- https://aventura-agence.lu/userfiles/files/sivigusisifi.pdfIn PDF document text
- http://22vek-omsk.ru/fck_editor_files/files/58541845170.pdfIn PDF document text
- https://anthonygillant.com/userfiles/file/sunitukowipikuxab.pdfIn PDF document text
- http://ackerviewguesthouse.com/userfiles/file/mutaviwisibosazowewepesob.pdfIn PDF document text
- http://ebslang.net/_UploadFile/Images/file/42033626998.pdfIn PDF document text
- http://www.videobezopasnost.ru/ckfinder/userfiles/files/jotepakalutegudibimexe.pdfIn PDF document text
- http://findingthegrey.com/userfiles/file/69133874289.pdfIn PDF document text
- http://ateliergermain.org/sites/default/files/file/77413290654.pdfIn PDF document text
- http://exmar.it/foto_fck/file/menujun.pdfIn PDF document text
- https://www.multilandtours.com/assets/ckfinder/userfiles/files/23143285056.pdfIn PDF document text
- http://liga-stf.ru/i/upload/files/44111493782.pdfIn PDF document text
- https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/13355036224.pdfIn PDF document text
- http://stowarzyszeniemalyksiaze.eu/img/upload/files/piloxovifuradufe.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_off0000af7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAF7C	16376 bytes
SHA-256: `b97b6a920837a6bf9d0aa6dde556a31ffc607da1ce3499a6ffb858411e279f07`
`font_01_sfnt_off0000d933.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD933	10436 bytes
SHA-256: `514e9a08db63d1af37ea9dece5a86c65f33a2183e650cd2b22783a75880c67c5`
`font_02_sfnt_off0000f0de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0DE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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