PDF malware analysis — malicious · 3a88d58c00f10f98

MALICIOUS

PDF

78.8 KB Created: 2021-08-03 07:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 9cead911f17bda16a81104a13cbeb82e SHA-1: 0278744f69d7e95410b91ec789ed246afd70263e SHA-256: 3a88d58c00f10f9836599f9ced7421aea4eae6cf437f7cf4f916580fc9421710

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9941

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be4a62ed65---48799981887.pdf In PDF document text
- https://dewalt-naradi.cz/media/upload/editor/file/69414274606.pdfIn PDF document text
- http://szyldkj.com/luodan/images/userfiles/file/25411311850.pdfIn PDF document text
- http://bbgannualseminar.com/clients/6/60/607ac775fa755cf068047886b2bbe24d/File/63080882937.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802e3177d0b---71756264177.pdfIn PDF document text
- http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beafd88ae3b---mipinovoforat.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ae071f6fd---gutef.pdfIn PDF document text
- https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/d5e3de2ec8f80d0fa9c93ff8f286b3de/gabipibuletamivikaxe.pdfIn PDF document text
- http://rosniyom.com/userfiles/files/70181470312.pdfIn PDF document text
- http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609b42d7952bb---94482632719.pdfIn PDF document text
- http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc29a5db1d---kogakere.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ds2l0lcjr5202imo986oi0ecb1/fezorizamofefulo.pdfIn PDF document text
- https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c205497a67d7d813e58f320af876b7fd/330901392.pdfIn PDF document text
- https://netiko.ge/img/Data/file/69076387571.pdfIn PDF document text
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/7eh8n841gndf26cdsi68i0e5f4/siwajumijigekaruvofav.pdfIn PDF document text
- http://www.wiz-fac.com/uploadImg/file/3569954564.pdfIn PDF document text
- http://hiddenforrest.net/clients/76790/File/9363025893.pdfIn PDF document text
- https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c215d102c4461c5f0066b610fd849862/16507376157.pdfIn PDF document text
- https://floridainvestment.cz/files/file/47205696910.pdfIn PDF document text
- http://metall-press.ru/files/76647301818.pdfIn PDF document text
- https://mo-space.space/web/img/podborky/files/32200172405.pdfIn PDF document text
- https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/50818ad8697be30b796419380bb5bfef/rosovejigosogebi.pdfIn PDF document text
- http://amblesidewindermere.ca/fckuploads/images/file/patelukodafuzarefemu.pdfIn PDF document text
- http://nakajima-ya.com/upload/save_image/files/vuxexewudimul.pdfIn PDF document text
- https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ad2c0ebff---37493020738.pdfIn PDF document text
- http://alliance-ltd.com/userfiles/dogove.pdfIn PDF document text
- https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/0bf9eab13d33e51d72efffd9715ec9ce/4906860193.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=quantum+healing+deepak+chopra+amazonPDF 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_off0000cfc2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFC2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e7d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7D9	11104 bytes
SHA-256: `f310b726c8f4b278eb2df37f3c923d6de9a8d3e0487c6fd2862134beeaa7f471`
`font_02_sfnt_off0001015e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1015E	16396 bytes
SHA-256: `659e348daf43b2917154683771ae7cc4a94712499b2674fff9b35839aaf90427`

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