PDF malware analysis — malicious · c3fcf4a767cf4745

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 19:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 44c7b4ddc6bb038c934ddc61b8d99e88 SHA-1: 1494087adf500f9207bf66da67551155368e8e69 SHA-256: c3fcf4a767cf4745a7b51b9c66005fb2ab9c92e46f98631b103fb1270645d7b9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through a spearphishing attachment to access these external links.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=find+the+sum+of+the+arithmetic+sequence+calculator PDF link annotation
- https://beaszemin.com/files/mefebaz.pdfIn PDF document text
- http://drumlockingclamp.com/FCK_Editor_Images/files/sokixakuviwuvexadojifudi.pdfIn PDF document text
- https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/fotenokuvilesulu.pdfIn PDF document text
- http://muzeumostrowiec.pl/obrazy/file/67769040390.pdfIn PDF document text
- http://doctour.hu/uploads/ckfinder/userfiles/files/lubirurusawokefasaninu.pdfIn PDF document text
- http://0851gay.org/userfiles/202109file/2021090820174770554.pdfIn PDF document text
- https://network-italia.com/file/gaxizug.pdfIn PDF document text
- http://nut-shell.net/upload/files/pokipivofajexamenivozowe.pdfIn PDF document text
- https://gbp.dropship-online.com/userfiles/files/tubijufajekesasit.pdfIn PDF document text
- http://webinaris.blog/ckfinder/userfiles/publics/files/fikibuzuwatogosala.pdfIn PDF document text
- http://synhbio.com/upload/files/rujala.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fc4a50c0c---46418955352.pdfIn PDF document text
- https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d8dbdafa5bb211d80dc1cc709fab126a/25944894650.pdfIn PDF document text
- https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/45628782381.pdfIn PDF document text
- http://www.examnotice.in/uploads/files/xizusevawajulizipururi.pdfIn PDF document text
- http://easyreturn.store/userfiles/file/1015630518.pdfIn PDF document text
- http://ibookingkr.com/FileData/ckfinder/files/20210907_43706B2E8BBF6EBE.pdfIn PDF document text
- http://falegnameriacastiglione.it/userfiles/files/dejejaremasodevu.pdfIn PDF document text
- https://nhahangphongcanh.com/uploads/files/burekotetarubukapixufa.pdfIn PDF document text
- https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/3e1436ee9360f2c24871ec4dc29ff194/mofagifetajixot.pdfIn PDF document text
- http://sro52.ru/uploads/files/44117263034.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b7b5062b4fdf63f5403b4f62c3e1b965/bebirebevi.pdfIn PDF document text
- https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/subawigizi.pdfIn PDF document text
- http://ulsantour.com/FileData/ckfinder/files/20210903_2F3A28A0DF9BFE64.pdfIn PDF document text
- https://asfus.net/virgsurv/userfiles/file/21961660671.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_off0000d8f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8F8	18740 bytes
SHA-256: `b66e1f40b0f722796f4f6b9bf94d582c82d380dff6f38d220fc7fac045fa53a5`
`font_01_sfnt_off00010a16.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A16	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001222d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1222D	10964 bytes
SHA-256: `9c6da244d87fc0a4e74d062a2601fdfe4a869162c7e738aea93a308b07e46dbb`

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