PDF malware analysis — malicious · c38166da99d9a4e3

MALICIOUS

PDF

87.2 KB Created: 2021-07-20 16:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 3b6198b9328ed2cea7973fa03bacfad5 SHA-1: 9ec463ad4b6818a4d398f65f40b66e84cdd9cfc7 SHA-256: c38166da99d9a4e39073c3d824ab74578565ad1ccb5064550d33cccb3dce1fac

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV and an ML classifier as malicious. It contains numerous URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The presence of external URIs and link farm heuristics suggests a phishing or malware distribution scheme, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5773d59bc---38217069790.pdf In PDF document text
- https://299-45.com/CKEdit/upload/files/porazunemarapilakeweruf.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/31bcef29fee8024abc24075681fba737/finupevigi.pdfIn PDF document text
- https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d98e6fa9cfb---18239380873.pdfIn PDF document text
- https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7de9cc04---10180979428.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8bcb2e0d---tojuzuxaw.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b99f473bb4d8f2eab92a79a9ef12eeb4/waludawaxigakawozakaku.pdfIn PDF document text
- http://mientrungland.net/uploads/image/files/72811776489.pdfIn PDF document text
- http://ozdoby-betonowe21.pl/Upload/file/42441440096.pdfIn PDF document text
- https://caribemed.com/userfiles/file/1619860738.pdfIn PDF document text
- http://aylincinarli.com/fckfiles/file/4845009439.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984847b7a7e---vosugoduronesotelemus.pdfIn PDF document text
- http://automozg.by/upload/editor/files/43186112398.pdfIn PDF document text
- https://teyadegitimvideo.com/calisma2/files/uploads/69697197210.pdfIn PDF document text
- https://dudikom.pl/userfiles/file/kamivekiwe.pdfIn PDF document text
- https://tdsns.ru/userfiles/file/vureviridigovufizapizugil.pdfIn PDF document text
- https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/971b7458ab347b8d44bee8643f5255d6/zazozavis.pdfIn PDF document text
- http://pr-jam.com/ckfinder/userfiles/files/16081680791.pdfIn PDF document text
- http://masan315.net/board/imagefile/file/samabesuxex.pdfIn PDF document text
- https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/gogoxipako.pdfIn PDF document text
- https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9890714b22---tewires.pdfIn PDF document text
- https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/5cd75ae46dcf3fe7fde0f7edd745cb34/25371238871.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ost7flq8pe4moeqtejj85cjou7/lelilofotomajodubilep.pdfIn PDF document text
- https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/gu61qtrrhq72q4l7g0j5s8dbc0/zutifipefesoparavepuzim.pdfIn PDF document text
- https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160793d2c2a02b---98450621359.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=town+hall+clash+of+clans+wikiPDF link annotation
- https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/c36c31c2408f28eebc775ad52c9c8d5f/wozibemipimakotunimuzar.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_off0000f375.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF375	10244 bytes
SHA-256: `77aed831bb7f6786ce12b284ad857ef35428ef704ef09f5d230e796234744123`
`font_01_sfnt_off00010a70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A70	17320 bytes
SHA-256: `ed0d94503c795a482147c59dd7006b2878f3df8060588415428ef403de6f62d2`
`font_02_sfnt_off00013738.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13738	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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