PDF malware analysis — malicious · 0a1bf33925453bf5

MALICIOUS

PDF

69.0 KB Created: 2021-06-30 14:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: f5bbd2c27f48258ebc3eb7f9b73af1d8 SHA-1: 4df92ec27405f28f134a13ee66573e1350c1819c SHA-256: 0a1bf33925453bf533e58cc0edb1536f47769e03beca7129b065933e9dd23b0e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to phishing pages or download further malware. No scripts were extracted, but the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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://inwebjor.ru/uplcv?utm_term=leather+strips+item+code PDF link annotation
- http://yongqingtech.com/d/files/88931613590.pdfIn PDF document text
- https://areicon.com/images/file/kekojejudifuxizemuxudomu.pdfIn PDF document text
- http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/xedabudorigogaw.pdfIn PDF document text
- http://ksnjl.com/userfiles/files/ferexedaziregelanana.pdfIn PDF document text
- http://ttccid.com/userfiles/file/33943578363.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160bb09039f39f---wokaxuwitoj.pdfIn PDF document text
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/0f3bddd1884ed2439891b8f18f06796f/32785161410.pdfIn PDF document text
- https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/bdee9b52f2855e053fe7a42f8d87bb90/70866684672.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609084da273d2---64686805355.pdfIn PDF document text
- http://www.buildingmalawi.com/images/uploaded/documents/5440097473.pdfIn PDF document text
- https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/767d2292f15386a2e968502ea0c6bff3/5757169799.pdfIn PDF document text
- https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0238060b6e18a4fe30809a72ac2409cc/82830722457.pdfIn PDF document text
- http://ccswcd.com/userfiles/file/bogaxajolutinamari.pdfIn PDF document text
- http://skolicka.eu/foto/images/file/bonuxenajebofemazujezixav.pdfIn PDF document text
- http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d52f0d3b96---88390329390.pdfIn PDF document text
- https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/fad2ecfee47b66735777152c8bf266a9/6947401059.pdfIn PDF document text
- http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd15a53f1b---wixez.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16072260408655---tenarupibokaman.pdfIn PDF document text
- http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/9ludsdgnaiu3ddvbe098v8hjv4/mopanozefusofusitiw.pdfIn PDF document text
- https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dd670aede---lirotopatawemitamavi.pdfIn PDF document text
- https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/74b759d46590dbdbe464521d53783e0b/60644973778.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160929acaddcb8---92709579569.pdfIn PDF document text
- https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e90ebbcc219616dbb9ab50f5df919143/96721405444.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_off0000b24a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB24A	10584 bytes
SHA-256: `d4b9d30797459b8349b62e56661066f41f60a0c7ae0cddfd05a8db35ddfc797e`
`font_01_sfnt_off0000ca76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA76	14456 bytes
SHA-256: `2db8325f0e4a3893d07075106929e5a0257dfe2eee9996f22f370500e27bbb30`
`font_02_sfnt_off0000eec7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEC7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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