PDF malware analysis — malicious · ad188c1bf13cdb5b

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 18:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: e0e7b61db7c65cb7e3c048ba2e55361e SHA-1: 742e55b0a2ae97fca72301b6d833985a1b96318e SHA-256: ad188c1bf13cdb5beed4430d6777230f22a1b1c44219d4d7bae50fc905a63695

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware or facilitate phishing. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The primary attack pattern involves using these links to lure users into downloading malicious files, likely disguised as software installers.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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=nitro+pdf+free+download+64+bit+english PDF link annotation
- https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7fc80e5f9a72b234f8cd40ed78b530cc/zerawu.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c3438e0c66---fenalekadonijojemuxojirup.pdfIn PDF document text
- http://statewideroadservices.com/clients/879378/File/43945183599.pdfIn PDF document text
- https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/3ddefbfb02de397eed0d5eb3ebe227ba/rawirapojumejoluz.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/22ma85eraq7crpq4r2mr3rncm4/vogakozosotifijazorametu.pdfIn PDF document text
- http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7aea25072---lezulavugagomibuzegew.pdfIn PDF document text
- http://perles-del-beya.com/userfiles/file/62863938865.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd054b700---97777725506.pdfIn PDF document text
- http://mariopresto.pl/userfiles/file/2745720240.pdfIn PDF document text
- https://vatlieutaphu.com/upload/files/2189356297.pdfIn PDF document text
- https://watertorens.nluserfiles/file/lopafoduwudutevo.pdfIn PDF document text
- http://nepodoshlo.kz/ckfinder/userfiles/files/82743517900.pdfIn PDF document text
- http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/82804766161.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1aed75235be1dfb3a0d4922ea1b1f613/silagovojugejadupevor.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b02ae8bd3---93469859132.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b3646082---xuguwi.pdfIn PDF document text
- http://cuatudongsaigon.vn/uploads/files/42227298647.pdfIn PDF document text
- http://americansemitruckparts.com/d/files/8162948319.pdfIn PDF document text
- http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7a266c50---56827086169.pdfIn PDF document text
- https://patriciobanados.cl/upload/file/In PDF document text
- http://cathyknightwaite.com/ckfinder/userfiles/files/ponapubakinotof.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb69f18a4f8---99614979881.pdfIn PDF document text
- http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/xuxugibajoxibuzuzemogu.pdfIn PDF document text
- https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/4gep6p4820a4q0qcljhdq6chr6/livoresojumij.pdfIn PDF document text
- http://miass.realxenon.ru/uploads/files/mafubigaz.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/50aac7f732b1778f8a7d2e98e2d2757d/41645059.pdfIn PDF document text
- http://usmleworkout.com/files/file/4982887780.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_off0000e656.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE656	17984 bytes
SHA-256: `dc0ee25827e678f4338645176f6549bde6b8575c39b721eb4bb2a711c02af005`
`font_01_sfnt_off0001154d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1154D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012d64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D64	11224 bytes
SHA-256: `f9b2255562f059c9f663d6ecefd1d41d9fa1a6572140b485caed6f6291ce0a41`

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