PDF malware analysis — malicious · ad45ae711134e39c

MALICIOUS

PDF

115.1 KB Created: 2021-09-06 11:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: f33375097e2de1731ada87c5a5b5eadd SHA-1: e233548afd7ada1c51a6d91ca2f481294520b4a2 SHA-256: ad45ae711134e39c3450dff04bf5d36d8c7003f0848fd8bd27f3ee47b4375495

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to domains that appear to be compromised or disposable, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

Nyx PDF Classifier malicious score 0.9880

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://singlesync.com/userfiles/file/lofeliral.pdf In PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609a77dd8fda1---79135024052.pdfIn PDF document text
- https://aquafilling.com/userfiles/file/jaxese.pdfIn PDF document text
- https://hijaulumut.com/contents/files/74224774086.pdfIn PDF document text
- http://mariamozharova.ru/uploads/files/mugoten.pdfIn PDF document text
- http://infas.cz/images/wiswig/file/piruparugeti.pdfIn PDF document text
- https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/4a36aa7cb74325e97d100f5b34c4e6ce/ferobarasiw.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4fc7ecce5---4108967892.pdfIn PDF document text
- https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaf1b1c2a7---78869222515.pdfIn PDF document text
- http://assushop.com/userfiles/assushop.com/file/makawivonevililefovexox.pdfIn PDF document text
- http://deltastal.ru/userfiles/file/fubidiv.pdfIn PDF document text
- http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5fddca4155c4e97d7ed416afd362f913/disiza.pdfIn PDF document text
- http://morethancars.nl/uploads/edytor/file/bimadurarikupija.pdfIn PDF document text
- http://thanhcongtechtra.com/upload/files/merudinaduxomax.pdfIn PDF document text
- http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303c447173a---pululafedosawewukomov.pdfIn PDF document text
- https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc2e0c093a---1057071331.pdfIn PDF document text
- https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/h9b1kf8r3q4vij39op1ce24ukk/6202240215.pdfIn PDF document text
- http://kitpaisal.com/mypicture/file/72253046194.pdfIn PDF document text
- https://ovistar-dz.com/ckfinder/userfiles/files/fatufegezepatulol.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fbecc348a---51850759309.pdfIn PDF document text
- https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/c289bf589da81cb182c1828218efafed/lobetosoxizapinexo.pdfIn PDF document text
- http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd1fb0188b---38398350237.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1b5c59980---66861719305.pdfIn PDF document text
- https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/krgmln9tc226vpljvldupq901n/sulev.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f07edb89d---nuxiratimafetelimalap.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c31eae133---temud.pdfIn PDF document text
- https://dagvandearchitectuur.be/_files/file/mamiwojebagonisudi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=proposition+in+a+sentence+pdfPDF 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_off00015c49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15C49	10568 bytes
SHA-256: `20f3fc51dfc6ee5f55e265a21302cc800ccc5fa758d7f2b9405b06fe26eae025`
`font_01_sfnt_off00017483.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17483	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00018c95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18C95	19328 bytes
SHA-256: `ac90646b489505e2e2d9421ca8cab649aca4b09d026c14b1618f0c5e9211f367`

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