PDF malware analysis — malicious · 3849844d4cd68097

MALICIOUS

PDF

95.7 KB Created: 2021-07-18 10:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 73719b1199bc63a4bdb6f71eb02e90c5 SHA-1: 5fe5508aca6588fe32b4561e04a0a32bad4bf36d SHA-256: 3849844d4cd68097196b462fb676d5fc38427e878feb86fa7c9754ad9509e895

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document's structure and the nature of the URLs suggest it is part of a spearphishing campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9937

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.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076acb70724f---28073679859.pdf In PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad81cbd2d5---4110351251.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609895ce60cc5---6174282734.pdfIn PDF document text
- http://qiuyutv.com/userfiles/files/20210603124752.pdfIn PDF document text
- http://benthanhsgfarm.net/images/uploads/files/3169306402.pdfIn PDF document text
- http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c45a79ede86---55575225578.pdfIn PDF document text
- http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983b8074760---vifugakaxefijubiwo.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/41570c5604c288e281018dd9a9680190/pexewuvojokonaxivulug.pdfIn PDF document text
- http://leguido.net/files/nenazugokovoxejiwupag.pdfIn PDF document text
- https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/09dd1c3e761455ac40d88589361e5ec6/50094821580.pdfIn PDF document text
- https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/017eb69d3f374d18a3e512b6f3817711/37700817442.pdfIn PDF document text
- https://asthasupermarket.com/userfiles/file/80056790137.pdfIn PDF document text
- https://supermagnum-bg.com/userfiles/file/potesopovekafozewil.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/baf6f846e704035cd05bfbd82cad13d7/kejoguvikes.pdfIn PDF document text
- http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609b455af2edb---67423186465.pdfIn PDF document text
- http://roocenter.ru/upload/file/15166323175.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec2222cb9---xebijonaxi.pdfIn PDF document text
- http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c4456b45ce6---14636349674.pdfIn PDF document text
- https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8041gd9nib7obut4binrgbn25e/bexuxaramuxaxodevo.pdfIn PDF document text
- http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c7bfc5d57---remupebofuz.pdfIn PDF document text
- http://bfr-bialapodlaska.pl/userfiles/file/samup.pdfIn PDF document text
- https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a3c8c5abcb2f7b0ea698a1c16b3eace8/juwusesozozawupukek.pdfIn PDF document text
- https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/82acfc855485839eef6dd3d9b5fd51ba/56505508880.pdfIn PDF document text
- http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/87915165484.pdfIn PDF document text
- http://www.horakgolf.cz/ckfinder/userfiles/files/2315039771.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wheatens+for+salePDF 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_off000114c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114C8	10212 bytes
SHA-256: `2780d438e7ec50cd59b2f46fc2374a026ce39fe94caf390a9a5b622873a49197`
`font_01_sfnt_off00012bae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12BAE	16988 bytes
SHA-256: `671df0d73b9d9b3823c666ced327e6e72d8523c5d84b72dc206e438db0a74d03`
`font_02_sfnt_off00015852.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15852	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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