PDF malware analysis — malicious · 0687b91b1355abb2

MALICIOUS

PDF

86.4 KB Created: 2021-07-20 00:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: c1d172153c40f4b3e9017d80c04c7a73 SHA-1: 9584d1e63daef331c42081c4056882a68c80e23d SHA-256: 0687b91b1355abb2aacb117b95388aee423e06a196dda1ff32cd0cb558de8159

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely intended to host or distribute further malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination or for SEO manipulation.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160950867dfda1---baferaf.pdf In PDF document text
- https://jotekonybakterium.hu/userfiles/files/15567191481.pdfIn PDF document text
- http://baovevietnam-vnss.com/upload/file/gaxaxomofakogutesep.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9fe6c07a8---gugexofewosedurawanag.pdfIn PDF document text
- http://classtool.info/upload/files/33947733719.pdfIn PDF document text
- https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/5l9e4urv2resdeaqm5mqo98ls3/limamowed.pdfIn PDF document text
- http://lifecare4all.com/upload/files/74894777821.pdfIn PDF document text
- https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16080f166a27e2---46199146933.pdfIn PDF document text
- https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d8e22db61---55146601096.pdfIn PDF document text
- http://seyrimerdin.com/userfiles/file/51351516226.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc6daf442---buxuretufo.pdfIn PDF document text
- http://signexpowholesale.com/project-new/christianbook/upload_images/file/7819949983.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2abd016d1e---81638751284.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/1ar4u35djhp2slu77ap1r22fhi/wipanusifixowugokeju.pdfIn PDF document text
- https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/daf32a51c1b3f10270c95fd740868824/14062787993.pdfIn PDF document text
- http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88e1c397a6---xuleri.pdfIn PDF document text
- http://davidlbrooks.com/clients/868292/File/lonatovoxasovexar.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf94cd03b---majobiti.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bdf42fc6c---pulesotimarokilivefag.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858172a9ba4---3743628162.pdfIn PDF document text
- https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/619ee613cecc4efd34959979587fe409/solop.pdfIn PDF document text
- https://doosradashak.in/ci/userfiles/files/voledeweneseduvujasat.pdfIn PDF document text
- https://kheops-so.fr/ckfinder/userfiles/files/38592969575.pdfIn PDF document text
- http://ifaistos.reality.gr/~triantaf/images/file/19303056326.pdfIn PDF document text
- http://cec-intl.ru/app/webroot/files/file/14045518827.pdfIn PDF document text
- http://www.wiz-fac.com/uploadImg/file/nogesuduzizovaza.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=manganese+steel+castingPDF 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_off0000f1a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1A6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000109b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109B8	16280 bytes
SHA-256: `30f93436084fc40a475aade0ef22163191608e530e196a2a1aa7dd4bc65a218a`
`font_02_sfnt_off000133e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133E9	10180 bytes
SHA-256: `5cf2f3ee89fe7f52fd5c874f15fc1215cb7a355fcb68cfbf212faa47980f966d`

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