PDF malware analysis — malicious · ba37eae752061c06

MALICIOUS

PDF

80.3 KB Created: 2021-06-26 01:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 5878b78c19ebaf2cd61ac277e135de22 SHA-1: 883920cbc578f1d36a6455fcdc37541e119b70b0 SHA-256: ba37eae752061c06970206476c77dac34cd69c08eea23c2e1ddcb757f2f4e58f

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 contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The document body is unreadable, but the presence of these links indicates a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2890c68509---68759416418.pdf In PDF document text
- http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7a81a02c9e8c56f54957bbd432db2221/luzemev.pdfIn PDF document text
- https://wrd13.com/force/file/72339094793.pdfIn PDF document text
- https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160921ce8d0216---39113722946.pdfIn PDF document text
- https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/14740942026f96825846c8b58dad1e09/52484454495.pdfIn PDF document text
- https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/dmds45o7k44aeoc1uh75qfmfh0/jawamamemokevotidawutow.pdfIn PDF document text
- http://geose.ru/userfiles/file/maxegoviriwerora.pdfIn PDF document text
- https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/poperej.pdfIn PDF document text
- http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc3fbd3b9---12735917983.pdfIn PDF document text
- http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160815d480aba1---tasedavunewa.pdfIn PDF document text
- https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dbff1683d---nevomepefemafidafu.pdfIn PDF document text
- https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d4e25aa94e8a97af05cf6fc6bf904b5a/kudigu.pdfIn PDF document text
- https://daaeportrett.no/upload/file/83328556814.pdfIn PDF document text
- https://cornerstonelaw.eu/userfiles//file/setunidox.pdfIn PDF document text
- http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb39bb84d---74342965607.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806dcc616c3---fawusoz.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85298c1b9a---fujetulanixufofoxutojes.pdfIn PDF document text
- http://saharun.org/uploads/ckfinder/userfiles/files/tezatolune.pdfIn PDF document text
- https://serviceservice.eu/userfiles/file/fubakudil.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa42a0bc7d---99566140988.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28fe4e5f0---pinininizegafezexik.pdfIn PDF document text
- https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b78b34f31a5---nivenidaguko.pdfIn PDF document text
- http://anma.pl/anma_edytor/file/65048556500.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096d5c0b8c0d---26363477173.pdfIn PDF document text
- http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5540154fa---sajexajutezizaletolap.pdfIn PDF document text
- http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/85c898ceb92619037b0804af3290ad89/vekinufexolerelivilazali.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=whistle+sound+mp3+downloadPDF link annotation
- 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_off0000d39f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD39F	17684 bytes
SHA-256: `b72527534378decf7bf6f41793b60d63bcecd761c98b31be9f40708db258ecb4`
`font_01_sfnt_off00010293.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10293	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011aaa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AAA	10908 bytes
SHA-256: `b1feca5c5c75c5860dbc4158fcfc0a2408227891d9f581f65f1549919804b74c`

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