PDF malware analysis — malicious · f1fafdf81eef3804

MALICIOUS

PDF

89.3 KB Created: 2021-07-01 09:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 848e413e7b4f1f680204ca037cd9ee1d SHA-1: 1f2404db329d2923b2eb06673f73d6b9bf3c11d0 SHA-256: f1fafdf81eef380450b7122931eb50aed8fab9667d78da943b707ec762efc66c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=need+for+speed+most+wanted+portable PDF link annotation
- http://archi1919.com/smlclub-files/file/vogazes.pdfIn PDF document text
- https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/d0207sd0srhb7mg9l4o6pbl6s5/kesesalegukirusibak.pdfIn PDF document text
- https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a488a3ef2---51212015467.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34cd7994e6---leguzutikusimajaxugewiw.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/3863adb49b1199547fafe1d706cdbba4/56571166499.pdfIn PDF document text
- http://immobilieninvestors.de/userfiles/file/73785221740.pdfIn PDF document text
- http://matchedtubes.de/userfiles/file/38204288252.pdfIn PDF document text
- http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608527f410c67---zuwap.pdfIn PDF document text
- https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be77dd41dc4---16877356.pdfIn PDF document text
- https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/872e26547c9abfa1b926401a4398b576/46996868203.pdfIn PDF document text
- https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/83fm63lqe5ju1rnhttnadgjcn2/gowoxolijuvan.pdfIn PDF document text
- http://bydnjl.com/userfiles/files/52888051022.pdfIn PDF document text
- https://abugfreemind.com/userfiles/file/27821794048.pdfIn PDF document text
- https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1e78a04c2---bilopar.pdfIn PDF document text
- https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/727d8c7695dcdd7c49cad027053c07e9/19002802765.pdfIn PDF document text
- https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/c92cb9130e1319cb841b5c613a2d2aea/kamaj.pdfIn PDF document text
- http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07b757079f---bulagafadotik.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68fbb8be3---22775817628.pdfIn PDF document text
- http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607051ea2de15---gobunumutuxosipebu.pdfIn PDF document text
- https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/83d843e23277c64d7f5b25d24143196c/bexexejupasurejebusun.pdfIn PDF document text
- http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/dufimatax.pdfIn PDF document text
- https://seripin.com/calisma2/files/uploads/sagamadidaxapemevon.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d076817c01---91369672107.pdfIn PDF document text
- http://tokyoto.pl/UserFiles/file/78234358645.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_off0000f30d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF30D	19600 bytes
SHA-256: `43feec205cd1029e1c50d079ecd64cd57e939716a66307e4e155e4ec4a7120c1`
`font_01_sfnt_off00012551.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12551	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013d68.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D68	10768 bytes
SHA-256: `1cfceabc02c518f02dc3634429d89f3767305b0bec34e828d142ac964d5c9bc5`

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