PDF malware analysis — malicious · 2d56c20402746d86

MALICIOUS

PDF

74.9 KB Created: 2021-09-02 22:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: e616edd8a6c4d3300d8a01b10513382b SHA-1: c14eda60318946cb7e27c2b582f886e95d2c48a2 SHA-256: 2d56c20402746d864af8b258f7da97107f40e3217424ef3828bc84760672105f

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the links suggest an attempt to redirect users to malicious content, likely leveraging T1059.007 (JavaScript) for exploitation within the PDF context.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 7

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://smidgel.ru/uplcv?utm_term=maluku+tengah+dalam+angka+2016+pdf PDF link annotation
- https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb5e4f31c---satubebetunow.pdfIn PDF document text
- https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/26e073cf67cb9dfd4e33e981181805ab/81700955709.pdfIn PDF document text
- https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/57e619ecc7dbceddfe6b87e033d66a62/36858177805.pdfIn PDF document text
- http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095f9b56dbd1---gozemewamoxerugebe.pdfIn PDF document text
- https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c6e5e8b7a7c064237255cdc3cd7be3ef/55578425167.pdfIn PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609855fa2fd2b---14766836222.pdfIn PDF document text
- http://dietmoiquangle.com/webroot/img/files/23924483378.pdfIn PDF document text
- http://matstravel.ru/userfiles/file/sesoworav.pdfIn PDF document text
- https://faktxeber.com/resimler/files/gaparafugabem.pdfIn PDF document text
- https://fotobolfestmeny.hu/mvc/userfiles/file/xedonejuwu.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/eee3305d7e19ba9e0dc7b38083b3b64a/wojekepufomi.pdfIn PDF document text
- http://axiomestates.com/userfiles/file/39794735702.pdfIn PDF document text
- http://lso-msm.fr/userfiles/file/pavakesafib.pdfIn PDF document text
- https://horkolas-gatlas.hu/ufiles/file/witurero.pdfIn PDF document text
- https://actor-conseil.com/files/file/59273633301.pdfIn PDF document text
- http://www.slenderclub.cz/ckfinder/userfiles/files/47750418821.pdfIn PDF document text
- http://kengosushionlineorder.com/uploads/files/17285688654.pdfIn PDF document text
- http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/82926450283.pdfIn PDF document text
- http://bulk-supplies.com/userfiles/file/25556670898.pdfIn PDF document text
- http://staresecurity.com/userfiles/file/93573456607.pdfIn PDF document text
- http://clinicaveterinariacittadivignola.com/userfiles/files/xorudusodegufod.pdfIn PDF document text
- http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/1538131070.pdfIn PDF document text
- http://jdjcnc.com/upfolder/e/files/20210824023812.pdfIn PDF document text
- http://apple888.vn/luutru/files/28428497781.pdfIn PDF document text
- http://alfavit.tv/userfiles/file/zowaba.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_off0000c22d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC22D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000da3f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA3F	16300 bytes
SHA-256: `31d3f51d663fe3e2b0006baaccea5aa44a7a0d21a105ca9209dcf143b717a9d6`
`font_02_sfnt_off000104c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104C1	11112 bytes
SHA-256: `f0a7f0d52bb818a32d456d16d451a6753b58e7783f569db5d8e8a9c316d45664`

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