PDF malware analysis — malicious · 3a24a3d963638ce3

MALICIOUS

PDF

86.6 KB Created: 2021-08-23 13:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: bc5ac7d7308ffc7e4945ac88ebb7a9bb SHA-1: dfa74c9bce7476312c8e3cb9d39febcedecc1470 SHA-256: 3a24a3d963638ce306335b32bc4bf2563f80f4f69d5497a5dff97355dcb5662a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV. It contains numerous external URIs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=how+to+unblock+my+cell+phone PDF link annotation
- http://ever-pioneer.com/upload/files/pagewogekenolu.pdfIn PDF document text
- https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b9d0cc67a78b5f41107d014b164fe0dd/tovukev.pdfIn PDF document text
- https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9d59a5e78---13633080742.pdfIn PDF document text
- http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/97111903144.pdfIn PDF document text
- http://cooleywestbrook.com/clients/865832/File/juxivirajamageb.pdfIn PDF document text
- https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/73136eek1vt0k2p4ba0ge0gq53/tetepenutekajum.pdfIn PDF document text
- https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57fefb94a5---48215340250.pdfIn PDF document text
- https://ankaratemizlikcim.com/depo/sayfaresim/file/53240621549.pdfIn PDF document text
- https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/f2d4a7709bab35b2fbae55ddb7d7e0ec/33360092775.pdfIn PDF document text
- http://chroscina.com/userfiles/file/88511542029.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e275f045dd---31271203535.pdfIn PDF document text
- http://tentimesneedlehill.com/UPFILE/userfiles/files/14523466697.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093aae627827---gisubigerexu.pdfIn PDF document text
- http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac588e8ea21---19281097722.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8132t8088fabgnt687drm3kgn5/fijopikokipon.pdfIn PDF document text
- http://thienminhgroup.com/uploads/userfiles/file/96537376085.pdfIn PDF document text
- https://juraganmonyet.com/contents//files/57883176099.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6683de877---87803293240.pdfIn PDF document text
- http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23322e010e---wutadamezajaxalufenabidud.pdfIn PDF document text
- https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9a4749087f325e78bc6e16aec71f2fbe/38857701173.pdfIn PDF document text
- https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d23aca49df5a27fabf6b043ea600d109/lidubedejugetuxolowevifa.pdfIn PDF document text
- http://myflora888.com/ck_files/files/vasosogezofexuxitekoposux.pdfIn PDF document text
- https://szekszardportal.hu/userfiles/file/64832251687.pdfIn PDF document text
- https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160760b55eba24---getuputosuxaxuwijamewon.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_off0000ee3c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE3C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001064e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1064E	17356 bytes
SHA-256: `db2e6a8414a6ede9df3f59df59935d5b334c644477638ba32fd0230001c0848b`
`font_02_sfnt_off000133e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133E7	10640 bytes
SHA-256: `ce50d4f3bfeaddc1ccfaf005db9c917df96c2739e27d9547713ffaabd2140940`

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