PDF malware analysis — malicious · 1a8cb1f280d9b720

MALICIOUS

PDF

71.2 KB Created: 2021-09-07 08:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: bf67be124dfc39bf5e7c5d6cf26d6a7f SHA-1: ac4ff25ef41c80f72d5060715df7a5ae9a65ec98 SHA-256: 1a8cb1f280d9b7207b8d3eacb86a95ca47ea7a44458fc649bfb404f92912a3a5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is designed to evade static analysis rather than convey information to a user.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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 https://ketchas.ru/uplcv?utm_term=letter+a+printable+worksheets+for+preschoolers PDF link annotation
- https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3b17a1d7f3e5b10fade3a663a8286d4f/21950404575.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124e93e3228f---gojowiwep.pdfIn PDF document text
- http://freeski.hu/freeski/file/25555569806.pdfIn PDF document text
- http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4304124596d66517ad89d6241517f425/voliluzijomiwok.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/bk2lpm6ckh5aeknoud6bs9h9g1/65621186934.pdfIn PDF document text
- http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a334e0ebab6---74304265486.pdfIn PDF document text
- https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/f3tebjnuc1oshh7g17m01rpg6j/zexiz.pdfIn PDF document text
- https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/44b15276270f5d40013c6a3a8172a904/38962869834.pdfIn PDF document text
- http://dgjst.com/upfile/file/pepelosivut.pdfIn PDF document text
- http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a226a701ba6---61271298055.pdfIn PDF document text
- https://evpersoneli.net/ev-personeli/file/10432476650.pdfIn PDF document text
- http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771448d7f5a---12319645906.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/1i3b7pesditpkd6j0gsvsdea5h/fomafubemijazavozujozuwar.pdfIn PDF document text
- http://mousike.it/img_ins/files/8332725503.pdfIn PDF document text
- http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098b32fc75fa---63453259638.pdfIn PDF document text
- https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/alevu5qlfohlr5uo57id2h752r/lubonapazilapazuvufip.pdfIn PDF document text
- http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160904697cfeec---96239325790.pdfIn PDF document text
- https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/61d334b29c1b9b0435f97590c7826cea/44850617277.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeea7f326b---bafid.pdfIn PDF document text
- http://karpatskiles.ru/store/file/86143240646.pdfIn PDF document text
- http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/setuwuzisetududevi.pdfIn PDF document text
- http://aldo-ins.com/userfiles/file/4522833136.pdfIn PDF document text
- http://jinistudy.com/_UploadFile/Images/file/fevitibigezimagogiji.pdfIn PDF document text
- https://jiu-hang.com/upfiles/editor/files/tesogix.pdfIn PDF document text
- https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/97ad9cea58398b1d7f316e0f41b33b87/49296702608.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928f2ce3840---vevimuga.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_off0000b785.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB785	10852 bytes
SHA-256: `d9bbefaaf03a275ca073e99354fd0a1609784270cbeb8cb2873e3fbb199234b5`
`font_01_sfnt_off0000d058.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD058	15188 bytes
SHA-256: `45cbe13047d87e98ec321ffaac8463daa54cf95cd95b30559a05dec767bf12eb`
`font_02_sfnt_off0000f680.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF680	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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