PDF malware analysis — malicious · f347da4ca48424ad

MALICIOUS

PDF

90.4 KB Created: 2021-08-19 16:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16

MD5: dcda7443253b33217b3e7f0ef46bca04 SHA-1: 9a10c521242f0b0f09f8b37c10967d93b0912cf0 SHA-256: f347da4ca48424ad16b0bd009e336c7b7c11d268f7d8e23fe4deffe29d1a5949

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, likely intended to host malicious files or redirect users to phishing pages. Heuristics indicate a high likelihood of malicious content, and ClamAV detection confirms this, classifying it as a phishing trojan. The document body is unreadable, but the presence of multiple links to potentially compromised CMS upload directories suggests a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9721

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b610af03e51---97885984189.pdf In PDF document text
- http://solar-makernavi.com/ckfinder/userfiles/files/tuvimubafejomal.pdfIn PDF document text
- https://ktmcollege.org/public_html/userfiles/file/62453537375.pdfIn PDF document text
- http://webcertain.net/contentupload/fckeditorUploads/organization_/file/98556235616.pdfIn PDF document text
- https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/lgdmmtvlln9qjag34pq07b34i0/28616568294.pdfIn PDF document text
- https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/5c6f60a9ae6e3f9e9503c0ba68f6743b/95276941149.pdfIn PDF document text
- https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/907c725332c195918d8fb87ab399780b/taveg.pdfIn PDF document text
- https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ead25b2c8b3bdd5935076898321ce4aa/likenoditinoj.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea3737154d---bafikularod.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abb66794337---lufadujazejobi.pdfIn PDF document text
- https://service-panev.com/userfiles/38801938647.pdfIn PDF document text
- http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160748a0c99fd0---28433948876.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f4f4f064c---bogexebofejovoxifov.pdfIn PDF document text
- http://geometrarontani.it/userfiles/files/xadopimojukagirumetabu.pdfIn PDF document text
- http://bpsstudio.hu/uploads/50624204232.pdfIn PDF document text
- http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b42b26efac---mirozovetogafumu.pdfIn PDF document text
- https://ddshower.com/ckfinder/userfiles/files/zujip.pdfIn PDF document text
- http://bona-agra.pl/Upload/file/temezinetatirotar.pdfIn PDF document text
- https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/398d160dfd894724525b0a204b239f75/sugumut.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/fb3b22392ba0e05ebada15c9dfcfdf07/27417670507.pdfIn PDF document text
- http://www.impactit.in/ckfinder/userfiles/files/vuwefikukejogirik.pdfIn PDF document text
- https://twr1115.net/files/fckeditor/file/48809850411.pdfIn PDF document text
- http://martom24.pl/martom/userfiles/file/ronanakubapijelewox.pdfIn PDF document text
- https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083f05bb02be---59155367991.pdfIn PDF document text
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/p37o3frq24hl6ip0emd89fvhjf/69599785290.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=limiting+reagent+questions+and+solutionsPDF link annotation
- https://lapdonline.org/file/47676532056.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e69f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE69F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000feb6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEB6	10792 bytes
SHA-256: `d73d1cbcd7a3084442bc6f22f08472b0ae81d61b0cb35bde59868b9abd87674b`
`font_02_sfnt_off000116f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116F5	16168 bytes
SHA-256: `1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68`
`font_03_sfnt_off00012c8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C8D	17172 bytes
SHA-256: `6f1d78d04dea90b093de6df7a41fa18469144db5e9276bf82dcabb0525d62520`

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