PDF malware analysis — malicious · 06ad531028345271

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 13:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: e391a1708fafa8e7e2481834a8e36909 SHA-1: fa25042903c6c7861ed8d4e0d6cab799b267d024 SHA-256: 06ad531028345271eb80a2bd990dea7660306fe520de4db81e83b0b1d3b750d5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristic analysis indicates the PDF contains a link farm pointing to compromised websites, including WordPress installations, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a high ML score support the classification as a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://allytemp.ru/uplcv?utm_term=epithalamion+and+prothalamion+pdf PDF link annotation
- http://sochi-vitrazhi.ru/ckfinder/userfiles/files/37874794290.pdfIn PDF document text
- http://sapientgenerator.ru/files/userfiles/files/53645878448.pdfIn PDF document text
- http://czerwoneiczarne.pl/files/file/fuwekinute.pdfIn PDF document text
- https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/41ebaea635efef39c17372273a2f45b9/gagexam.pdfIn PDF document text
- http://cobe-ing.it/userfiles/files/dutamub.pdfIn PDF document text
- http://gorsilawfirm.com/userfiles/file/25162632179.pdfIn PDF document text
- http://medi-sen.com/files/files/34954186154.pdfIn PDF document text
- http://www.derbysignandgraphics.com/uploads/file/1922062133.pdfIn PDF document text
- http://sity-luxe.ru/userfiles/file/43471938641.pdfIn PDF document text
- http://hoangminhphatkorea.com/webroot/img/files/nawisajuxisurafurinorivaf.pdfIn PDF document text
- https://cvsc.co/userfiles/file/kubamenezusoxuwulan.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321adcc6488---zojimofumefebeli.pdfIn PDF document text
- http://dmhu.eu/uploads/uplib/file/pixofubupod.pdfIn PDF document text
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c08a908bfae3f840ff357db432164a51/gesemedamalowat.pdfIn PDF document text
- http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/7n487q8amob9fl7bufakj9ld12/58713077976.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c99d36d8a4a---wedudavoremu.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7efea82ba---ruwusatorokawasil.pdfIn PDF document text
- https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/i78kohssn1lfk6e43520564qg8/6295889038.pdfIn PDF document text
- https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/kl40p2i4ckkd157jlub2l11j49/31755919923.pdfIn PDF document text
- https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9b588e8a058b4fcbdc4c357024d60120/26198570012.pdfIn PDF document text
- https://zapret-rf.org/web/img/podborky/files/22427657608.pdfIn PDF document text
- http://davidhammerstein.org/userfiles/file/vigakudepubekojowajovafut.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b881f75c298---bolojavawavuwutenobedetu.pdfIn PDF document text
- https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/307e24b6a34d32e133a8cf2cc58c3226/6884521091.pdfIn PDF document text
- http://sclifeguards.com/clients/16854/File/nuwoxinezudetobemod.pdfIn PDF document text
- http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/kektjqcv0q8n4p864moi3s3n0a/900828319.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_off0000deff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEFF	10444 bytes
SHA-256: `e77f0ccacb6868a4bc15a6e4291a2b0a33f9ed80c2cbc1fa862e318b28c8a0b1`
`font_01_sfnt_off0000f65e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF65E	18084 bytes
SHA-256: `0dd08d601735f14ca4fdd1a5a204a6bda3326a008d5ad6d272e831a791a9e2d0`
`font_02_sfnt_off000124ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124EA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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