PDF malware analysis — malicious · 7e12c9b3695a09d2

MALICIOUS

PDF

81.0 KB Created: 2021-08-20 15:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: cc7edb51c1c43c1a3adae76c6de9c598 SHA-1: 19b78eba5dcf3e7a2a89417c537f8cdf8cb4e24e SHA-256: 7e12c9b3695a09d258b9c5e5149dec4755b8a5c3e42469dfd0de822045a9a518

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination and leverage potentially untrusted hosting. While no scripts were explicitly extracted, the PDF structure and link farm behavior strongly suggest an intent to deliver a malicious payload or phish credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=counter+terrorist+mod+apk PDF link annotation
- https://aimhc.com/userfiles/file/wopozufedikuvidemaba.pdfIn PDF document text
- http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/79727575056.pdfIn PDF document text
- http://tbm-mova.by/images_from_html_editor/file/difasiwoluv.pdfIn PDF document text
- https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09d752a5f---79604246552.pdfIn PDF document text
- https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/spjm3fhdfbplgik0spk40er0ob/forutive.pdfIn PDF document text
- http://wahluenfty.com/userfiles/77701349788.pdfIn PDF document text
- http://resurrection-life.net/userfiles/files/kojorezavigu.pdfIn PDF document text
- https://ski-valloire.com/ckfinder/userfiles/files/74376763375.pdfIn PDF document text
- http://alhouti.com/userfiles/file/regewadivafetod.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bc639c04d1---ninusor.pdfIn PDF document text
- https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/44dc8068db1fa83feb345a7fd44b43da/lobatunux.pdfIn PDF document text
- https://twr1115.net/files/fckeditor/file/40364015032.pdfIn PDF document text
- http://adance0112.com/upfile/editor/file/28978691708.pdfIn PDF document text
- http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/p7pf31fkutmv93ot6t1g66umca/pevofosuvabozinebi.pdfIn PDF document text
- http://draftingfloorplan.com/ckfinder/userfiles/files/3237267995.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a7dd88e616784e78c97accaa9fbd5b91/gonenopasojuragog.pdfIn PDF document text
- https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/1bb52f22fc68e94a95513cc38d5d51d3/42064142428.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mn87q04gb861n4p3u9c8tbqjp0/fuvubotulaxugiwi.pdfIn PDF document text
- http://himalayakebab.com/shipinc/userfiles/files/6993193099.pdfIn PDF document text
- https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e7qf8f2bv9rjarmnnbhg94r4br/99552308112.pdfIn PDF document text
- http://dush-kz.ru/uploads/fck/file/81998221756.pdfIn PDF document text
- https://muzeumkonstancina.pl/attachments/file/bobepiwifexinanujuvu.pdfIn PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087aa95c18dd---22558805423.pdfIn PDF document text
- http://www.chatanakonci.cz/userfiles/file/xawokeriwubapu.pdfIn PDF document text
- http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e765dca59---xedubosinuxakowamefopevi.pdfIn PDF document text
- http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6acfe560d7---tafekobon.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_off0000d87d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD87D	10732 bytes
SHA-256: `d327d1771bb12c7f80a18ee61f4bea1d6291486347b5d5fb4ddadd90269f8300`
`font_01_sfnt_off0000f137.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF137	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010949.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10949	17056 bytes
SHA-256: `84a92ee7381690cef66fee5a9bd4dde5b52a2c54610cf72ab6d879ba12d1f9ad`

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