PDF malware analysis — malicious · 6e4adc88af159e01

MALICIOUS

PDF

89.9 KB Created: 2021-07-26 00:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: d9294f4f3b466f73a7f8ff539a9ef5d2 SHA-1: 01057a6ef36281375df3844a5599607bd71480ca SHA-256: 6e4adc88af159e012fc2f14b3b69039ff8cef2ab47ce4d6e5f46728f0531bc8d

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 embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves tricking users into downloading or interacting with malicious content via these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://tongdaidoanhnghiep.com/app/webroot/upload/files/gufajidoledu.pdf In PDF document text
- http://hagelkonzept.de/userfiles/file/94253260344.pdfIn PDF document text
- https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/612b8deeb6f7d3b817b8faf854ebfebe/riwudulalo.pdfIn PDF document text
- http://chelseafoodmart.com/uploads/files/parisenijirivis.pdfIn PDF document text
- http://danguykhoidoanhnghiephp.vn/Upload/files/68989681960.pdfIn PDF document text
- http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a11210e0e74---27169714722.pdfIn PDF document text
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc190da877---risepojeritefinisubo.pdfIn PDF document text
- http://9262895.ru/ckfinder/userfiles/files/33758141462.pdfIn PDF document text
- http://allamericannursing.com/userfiles/file/tevowuporutinafidezur.pdfIn PDF document text
- https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/abbe65173cec5f970eaac20ea748bd18/fopinewa.pdfIn PDF document text
- http://gekon.net/userfiles/file/84483670649.pdfIn PDF document text
- https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1191712189---karazozobugipurulo.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/uopdhol7lel5k1uhfpkb6abblj/21702355763.pdfIn PDF document text
- https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ndc5onhegmlu7ihv5kb6j7in6p/batevotub.pdfIn PDF document text
- https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16087584629808---visigulareg.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3hlvbs8064hfmcbrknanrd1c60/5726264736.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3a0e9f5d7---29815181516.pdfIn PDF document text
- https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/koikn58gap31j35j2f167kd4ui/3175723180.pdfIn PDF document text
- http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a685eaecd2b---88431221661.pdfIn PDF document text
- https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160926bc15a4ff---4216749170.pdfIn PDF document text
- https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4f02e416---555791074.pdfIn PDF document text
- http://ahlhy.com/uploads/file/29081600774.pdfIn PDF document text
- http://www.aadhar-interior.com/userfiles/file/kefivifirawudawitu.pdfIn PDF document text
- http://www.asslar.de/downloads/65795132413.pdfIn PDF document text
- http://xiaohecollege.com/d/files/malolofedilolulap.pdfIn PDF document text
- https://unserbiokorb.ch/userfiles/file/ramoseg.pdfIn PDF document text
- https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/e7878364b94db82c4379d62758297103/verufuvozima.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160703eb838788---37441404582.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=atividades+sobre+per%C3%ADodo+simples+e+composto+8o+ano+com+gabaritoPDF 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_off0000f5de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5DE	11312 bytes
SHA-256: `1f84b687328ebffe3ae7cacca8fe1542a44a8befced8c56a6336b8006ad8d3b0`
`font_01_sfnt_off00011003.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11003	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012815.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12815	18852 bytes
SHA-256: `bc9d62cdbd40fac07999e1f9f3d81d51143fe0880e769b8d75b2cc1c2060528e`

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