PDF malware analysis — malicious · c637e4361e0ff7c3

MALICIOUS

PDF

80.9 KB Created: 2021-08-17 13:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: fa1bb2b4f0d72f4bdacc86baaab27396 SHA-1: 01856eb518c67c31fbff69e9eab2655e7c21a02c SHA-256: c637e4361e0ff7c3a7d6edfb801b25e83b6263da61be2f9cb0c10f32d59b8587

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

Nyx PDF Classifier malicious score 0.9989

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://philabc.ru/uplcv?utm_term=harley+electra+glide+trike PDF link annotation
- https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/9078ab6eb9f4e5c889fdaf8b70ed757b/fokivisokifisijowomapo.pdfIn PDF document text
- http://westernmaki.com/uploads/files/75684550425.pdfIn PDF document text
- http://gat-asset.com/CKEdit/upload/files/5473219310.pdfIn PDF document text
- http://gagutp.com/sa_upload/userfiles/file/20210721073147.pdfIn PDF document text
- https://betentour.com/sites/default/files/file/76773898885.pdfIn PDF document text
- https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a9d113ff0d254dbd04031c5cce287970/16129146496.pdfIn PDF document text
- http://theprintfactoryvietnam.com/uploads/files/jaxorelipegefejizexajigit.pdfIn PDF document text
- https://nhanloc.net/userfiles/file/lokifuxobubewabokapovu.pdfIn PDF document text
- http://matras-devison.com/upload/file/15754312672.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e7b20a4c037630aa1a3af8e2833f3d1a/rirobi.pdfIn PDF document text
- https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/cek879uqevavr95l1vdc2vhpim/39397064242.pdfIn PDF document text
- https://sdhouse.info/ckfinder/userfiles/files/3917348564.pdfIn PDF document text
- https://foodsafebox.com/ckfinder/userfiles/files/75155376751.pdfIn PDF document text
- http://grgct.com/ckfinder/userfiles/files/18594527776.pdfIn PDF document text
- https://rpitrade.com/ckfinder/userfiles/files/pidojuwalojonuresolutare.pdfIn PDF document text
- http://travelsi.ru/ckfinder/userfiles/files/6726544798.pdfIn PDF document text
- http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160710a06d4c21---zujelawuse.pdfIn PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609b58ee5ea16---34071952752.pdfIn PDF document text
- http://x-site.by/upload/editor/files/vegopekujabufurikubik.pdfIn PDF document text
- https://pottoka.info/files/galeria/files/35036225546.pdfIn PDF document text
- http://www.umadai.com/ckfinder/userfiles/files/fobewitoxodulunulirigutif.pdfIn PDF document text
- https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/0fed976c126733086898da449474fcf0/dakasoxowalafiwomu.pdfIn PDF document text
- http://studioguagnoni.it/userfiles/files/lodesakasadunetegude.pdfIn PDF document text
- https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943b39608d5---kokoxukozexoxamizi.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_off0000d8b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8B3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f0c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0C5	17260 bytes
SHA-256: `8e40cc5dfdf027aa6e41c1e874054467dff336bd6eab501831eef324a5703c92`
`font_02_sfnt_off00011e4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E4D	10352 bytes
SHA-256: `9b5c35a6cd475af45239a55864f97afb7fda069a725fa0a231e0678171238899`

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