PDF malware analysis — malicious · c209b61d2326fc88

MALICIOUS

PDF

99.2 KB Created: 2021-08-09 09:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: e2f3ae33574350440c294c3c54c527e4 SHA-1: aedf9eeac66389c1eb13a6f3ffd5880067a83018 SHA-256: c209b61d2326fc88d6561da0f32f79fc75d2dfb34aa7cd242a9974bedcc79079

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs and the document's structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9906

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://fentesmakina.com/paket/upload/files/38333524205.pdf In PDF document text
- https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/gkh1qa84iihu9k3fkvm0uktf87/66117178584.pdfIn PDF document text
- http://kapelski.pl/userfiles/file/9052173150.pdfIn PDF document text
- https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/6190404450ddf9682593a6199825f511/rojalakiduwenegebelusonel.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160985fe2c26fd---76545763572.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d26bcbff2---tinofozojizax.pdfIn PDF document text
- https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/f9f2f34cfb1bf52ef69aa639ca89d9b1/dukejisidatadewimumos.pdfIn PDF document text
- http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609272f0710f4---7817538676.pdfIn PDF document text
- http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d328a6f527---48828803811.pdfIn PDF document text
- http://sportsclinicwest.ie/media/contents/file/zesubakerilelazekoxud.pdfIn PDF document text
- http://randalljroutson.com/clients/44711/File/27099574916.pdfIn PDF document text
- https://anmimar.com/royal/userfiles/file/fixigalujeza.pdfIn PDF document text
- http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/f18e3982116ff1b1c100296a62f32f9a/legovezopem.pdfIn PDF document text
- http://galsabino.it/userfiles/files/zutoxak.pdfIn PDF document text
- http://alda.pl/ckfinder/userfiles/files/48970552609.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35b9db6e9b---ragobox.pdfIn PDF document text
- https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4c6bc953aa23884749eea9ba37975e90/38328583163.pdfIn PDF document text
- http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e42d7c397---9785627089.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b2828a7a4f3---zumemiroriwuvepusuxoduk.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/cd12b6b313551d8b14454adcfd1ac5f1/desuzubuxu.pdfIn PDF document text
- https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/b1e0f428c62112f635cdd828bfb8c6a0/gogulim.pdfIn PDF document text
- http://fundacionecla.org/resources/original/file/36958567535.pdfIn PDF document text
- http://orbitsecurity.qa/pro_mvp_tech/uploads/file/dokogokod.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gta+san+andreas+polis+k%C4%B1yafeti+hilesiPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fc6c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC6C	10884 bytes
SHA-256: `96796e0472c60fe7213a68947fc91e3ff8b9bfdf65a76cea1e445df2b4c7e72d`
`font_01_sfnt_off0001157a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1157A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012d8c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D8C	21060 bytes
SHA-256: `c8e1b047157c01caa707b651eb8b5b0a035b471028c5229f1101a77e88f1d7ae`
`font_03_sfnt_off0001627b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1627B	17524 bytes
SHA-256: `f978954cf281daf52ffbf81f25a3a1572058b0f77fc94fefc97d9b8bc443612c`

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