PDF malware analysis — malicious · bb20da342f43471b

MALICIOUS

PDF

75.7 KB Created: 2021-07-13 23:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 9d549257b9fa1f85cbfb7945569a97ee SHA-1: 1de5432f09f5b3b3ee06c9d37b232519a6bd6d96 SHA-256: bb20da342f43471bb30d45b2bf98c4cccaa4dfb85831c89b86b6b1782d2ae235

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing indicate a deliberate attempt to host links on potentially disposable or compromised domains, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=collocations+exercises+with+answers+pdf PDF link annotation
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077b284d5529---jenikofoni.pdfIn PDF document text
- https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/53fd53a707ac9d32287b54c8626f2881/42305554653.pdfIn PDF document text
- https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/4b80d8c4bff370c67f24244c3a45b2d0/nufinosegudapur.pdfIn PDF document text
- http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076993c80132---motipanako.pdfIn PDF document text
- http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a00527494a---fijabiroviluperugese.pdfIn PDF document text
- https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6127cd8d73---55184437208.pdfIn PDF document text
- https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/fgsooi71rguvii1jp4ml2hh5ct/kesavuteg.pdfIn PDF document text
- https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ae4o9mratc17l8i8ikm9gndmpp/82284929384.pdfIn PDF document text
- https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/425878a64d65204ba32fb6dc5bf2fd83/pabezejuzulusa.pdfIn PDF document text
- https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/705c48f020e407d6235448506d73be55/xamopijixoka.pdfIn PDF document text
- http://nakatka.com/files/file/47120431714.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7766e293d---zakowowizofigamegapodu.pdfIn PDF document text
- http://bacsionline.net/userfiles/file/9664545540.pdfIn PDF document text
- https://ngusacdon.com/upload/files/logageviriferu.pdfIn PDF document text
- http://honda-vo.com/upload/file/80551537308.pdfIn PDF document text
- http://aptchasers.com/FCKeditor/userfiles/file/nekapofofaroraxokuvuz.pdfIn PDF document text
- https://rybczewice.pl/userfiles/file/zebizodepobafa.pdfIn PDF document text
- http://pensionpoint.cz/userfiles/files/xuwelivixemo.pdfIn PDF document text
- http://feg.vn/uploads/files/13771122064.pdfIn PDF document text
- http://train-in-japan.com/images/blog//file/waxiwimefome.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d396a3cabc2---19231252978.pdfIn PDF document text
- http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9cd7021e---dunilagemimizav.pdfIn PDF document text
- https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/odg5ep0l29hhif0ta6dnjo3cd7/lufirikapir.pdfIn PDF document text
- https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8bf77b71016afa2ef13b520d0ba43d33/29921275850.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_off0000c2dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC2DD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000daef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAEF	17148 bytes
SHA-256: `221299fcf557599cca0e6eeed7c08219755be37fbf091c74aa6168deb9a80ab7`
`font_02_sfnt_off00010629.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10629	10936 bytes
SHA-256: `e87650afee4660ac70bb0fb962d1fdb193f79b20572e0ab177d9117d979dfbe4`

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