PDF malware analysis — malicious · 43949df87e2d69c0

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 13:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 22ef8f617612555da86ef9dbda0201c4 SHA-1: 4b6f35c733bb518b407acef907482aec131a88db SHA-256: 43949df87e2d69c0faa3afbb56276566ae5d1cc1329db2ea90969abe8898feac

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URIs and link farm patterns suggests an attempt to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in phishing and tech-support scams.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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=blocking+pop+ups+on+android PDF link annotation
- http://bouwbedrijfansing.nl/userfiles/file/54802894333.pdfIn PDF document text
- http://mya1fc.com/files/ckuploads/files/83199554210.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131307d943a5---5211278437.pdfIn PDF document text
- https://sushixusa.com/userfiles/files/91501775869.pdfIn PDF document text
- https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/gqdu1b8ccimjcr2mlod2cgu1c1/febubaxijod.pdfIn PDF document text
- https://keluargamimpi.com/contents/files/54158445009.pdfIn PDF document text
- https://taichielite.com/louis/taichi/ckfinder/userfiles/files/mudezonakijetu.pdfIn PDF document text
- http://nzozkrowodrza.pl/uploads/editor/file/wakarajimukobinan.pdfIn PDF document text
- http://catherine-massage.com/ckfinder/userfiles/files/8709996618.pdfIn PDF document text
- https://7mark3t2-7aya.com/contents/files/9896655646.pdfIn PDF document text
- http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134c64ae64db---52394845311.pdfIn PDF document text
- http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/pusotibafamado.pdfIn PDF document text
- http://islandpointfl.com/userimages/68062140346.pdfIn PDF document text
- http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161387ade21555---xeromobaka.pdfIn PDF document text
- https://profix.fr/ckfinder/userfiles/files/10296254306.pdfIn PDF document text
- https://gamaconsultores.cl/upload/file/jitugulaxam.pdfIn PDF document text
- https://byocamacho.com/ckfinder/userfiles/files/98839552379.pdfIn PDF document text
- http://inter-travel.hu/_user/file/zazusitof.pdfIn PDF document text
- http://mobilahomedesign.com/userfiles/files/19559987890.pdfIn PDF document text
- http://birnagarcollege.in/userfiles/file/422697868.pdfIn PDF document text
- https://panama4d.com/contents/files/43726163409.pdfIn PDF document text
- http://julianina.de/upload/file/tanukabolevefagumigu.pdfIn PDF document text
- http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae0b45078d---papapufomibezi.pdfIn PDF document text
- https://giltmorestukko.hu/ckfinder/userfiles/files/79723634624.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_off0000d896.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD896	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f0a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0A8	18624 bytes
SHA-256: `5c343a74c6a855d973ad6e1b92bf2c3d942fb8b4a78624c061320a093b165c95`
`font_02_sfnt_off00012128.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12128	10704 bytes
SHA-256: `d394747359711a8066cee3c6329a80988887d7f77543dd26bf430e51924b949c`

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