PDF malware analysis — malicious · 8aaac665517f0f7a

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 06:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: dc9cc6579abf0ecbda8563b0b3fd48dc SHA-1: 16519088f0fb2457e848bdabe1d1929421894f0a SHA-256: 8aaac665517f0f7a0f33307742315f087c2981ad530ec809c4ddaa1ad0efa6d1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9934

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://wastran.ru/uplcv?utm_term=exponents+worksheets+9th+grade PDF link annotation
- https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b71119e49f0---zadubuwugofenuka.pdfIn PDF document text
- https://bawaniint.com/ckfinder/userfiles/files/69635100493.pdfIn PDF document text
- http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/523cca1fb83e8e009568420cae9f41aa/33484816737.pdfIn PDF document text
- http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160da34743bed4---vivebifuzej.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2d1f9404f28cb611f4bd5e5aed48197d/mebedosuvazaraxi.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b435822b7---92003222380.pdfIn PDF document text
- https://gites-les-bardots.com/userfiles/file/56260706427.pdfIn PDF document text
- https://incasur.org/temp//files/vomomuvadejapenuvu.pdfIn PDF document text
- http://ezstreetautosales.com/clients/876244/File/56343395318.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc524deaf---zebokajided.pdfIn PDF document text
- http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/kedanixitij.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/24a5449a782a3acb05e7b367491a9a0d/gobagepezavenebajin.pdfIn PDF document text
- https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e6ea609c5---janomel.pdfIn PDF document text
- http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eeb3393f21---wowumogojepabomubuda.pdfIn PDF document text
- http://duszek-lasu.pl/userfiles/file/puvoxiwi.pdfIn PDF document text
- http://esoftland.com/userfiles/file/fojuwebemeroxogelonojuv.pdfIn PDF document text
- https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c40d1c984---50576742671.pdfIn PDF document text
- http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64714418430.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/217dbf4ab9ca27c24beaeab97262b6d8/difemomon.pdfIn PDF document text
- http://seoulsquare.com/userfiles/file/vobotavizeji.pdfIn PDF document text
- http://yuanyoujie.vip/userfiles/file/dikutotigutel.pdfIn PDF document text
- http://vytvarnyobchod.cz/UserFiles/File/xaduxiwafovonuxijewuna.pdfIn PDF document text
- https://micast.de/wp-content/plugins/super-forms/uploads/php/files/dkp32mh8717sa099bohha2kfs3/rujobi.pdfIn PDF document text
- http://cesurmakina.com/userfiles/file/64876550849.pdfIn PDF document text
- http://zonwering-belgie.eu/ckfinder/userfiles/files/titisesorupuxef.pdfIn PDF document text
- https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/74a972d280a6c330d905f598b9a183c2/fixulubu.pdfIn PDF document text
- https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/b60a502594bb7acb54dd4f039222eabd/wozanivuz.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_off0000c60e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC60E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000de20.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE20	16672 bytes
SHA-256: `dc3b3bb16750bca71e1bf6498a14198628663a2a43a1ea8c5f50460451813d3b`
`font_02_sfnt_off00010970.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10970	10964 bytes
SHA-256: `877df7be439f42699f05211fa8b47ce8b9315ef19b079ad7cf9c4f3a9da8ea4c`

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