PDF malware analysis — malicious · 319f31a69a8d3dd3

MALICIOUS

PDF

86.2 KB Created: 2021-09-04 05:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 1c179ef271ec5d74e64e7966e15e1721 SHA-1: 423c90b2e10d89c6ab1ff2210e1bf17f96bb3c3a SHA-256: 319f31a69a8d3dd3ba98df9dae4a4eab6dbed6c249451c4bf7040bc34af87e68

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF acts as a link farm to potentially malicious external content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=pcswmm+2017+user+manual PDF link annotation
- https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2199909e---59515762816.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d250f502---98507084764.pdfIn PDF document text
- http://concilianavarra.com/userfiles/files/9856864006.pdfIn PDF document text
- http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d04f52c2da290035e60927cffd04d789/9597870130.pdfIn PDF document text
- http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1dde27937---bifabulofozaxan.pdfIn PDF document text
- http://bouncebodysupplements.com/newerac2c/userfiles/file/76273389639.pdfIn PDF document text
- http://ifa-astrologie.de/userfiles/file/vexidemekiwawos.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/k2dg2m6vd8q021rjorjifncmkq/gowevogizexemegi.pdfIn PDF document text
- https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/6db70ad71416ff06d6c2fc3a0d157a7c/wukokis.pdfIn PDF document text
- https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/bqug2md4nt5qfn8b55sqeicl8b/79644129717.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c4d8a7d11---lezelovali.pdfIn PDF document text
- https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e21aed5ab61e926db566059ba82eda55/51769097153.pdfIn PDF document text
- http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10e22a0cf---wugajawifexixewobapifupo.pdfIn PDF document text
- https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/c80c94ffb895bfb27fc7462820178660/wozonupuwatowenomu.pdfIn PDF document text
- https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7984c7b495ddc48fb1f712e2ad6d13e4/tibukisuwewej.pdfIn PDF document text
- http://coumert.com/images/file/79753147315.pdfIn PDF document text
- http://delshadian.com/public/userfiles/file/46665870947.pdfIn PDF document text
- http://geyikkimya.com/userfiles/upload/file/99468317551.pdfIn PDF document text
- http://katachizu.com/img/news/files/finufenov.pdfIn PDF document text
- https://dm288.com/slicice/file/65984859944.pdfIn PDF document text
- http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5315681e5---72727850912.pdfIn PDF document text
- http://frigotechreina.com/userfiles/files/5217604748.pdfIn PDF document text
- https://pharmawell.eu/ckfinder/userfiles/files/fezukopi.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-5-7/20210507041435353519.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_off0000ebc9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBC9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000103e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103E0	10612 bytes
SHA-256: `938c9dda08ca6e425f15f6e5f299a65c31435b6a5fb900cb1263c1d7d6564097`
`font_02_sfnt_off00011c57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C57	17992 bytes
SHA-256: `551138d805e5da536f6d03b046216a7a079e46c85e5de608031ce0143a7a117d`

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