PDF malware analysis — malicious · 50b7204913110615

MALICIOUS

PDF

89.4 KB Created: 2021-07-21 17:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 52fd52a5384adc72db36d0a6a30477de SHA-1: a8fe3c252e79c75a0b6d8ebc211be50c87d58b6d SHA-256: 50b72049131106155836e4f6d77a7ba338b9c44d294fab3771f1b8fe5171502a

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 Pdf.Phishing.Trojan. The document contains numerous links pointing to compromised CMS upload directories, suggesting it is part of a link farm designed to manipulate search engine results or redirect users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of its specific lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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 http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d99e05bed---85044201876.pdf In PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ca4a3669e---kojusobivizexokow.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de6668b099a---11953579790.pdfIn PDF document text
- https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160becb6fda76a---39016092753.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b16a5938537b6bd945ea763daa223aa5/zulofusedoloxeb.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8562ddc73---zemalopupewagexisake.pdfIn PDF document text
- http://reikihaus.com/clients/75291/File/vatidigagaravadot.pdfIn PDF document text
- http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/425d96f8633e7e2f5b9b447d5ed538b4/tafitodaman.pdfIn PDF document text
- http://mlsconsulting.net/cms/files/File/judebetojuviwifetuj.pdfIn PDF document text
- https://bandotrading.com/uploads/file/23905680018.pdfIn PDF document text
- http://apcmagon.com/userfiles/14976949789.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976ef3a31c3---xepuforilus.pdfIn PDF document text
- http://emke.hu/uploads/ckfinder/userfiles/files/golajadovekomonodaz.pdfIn PDF document text
- http://nissanotogovap.com/uploads/images/files/jodidosukenike.pdfIn PDF document text
- https://adtw1.com/ckfinder/userfiles/files/viviwuxolanigunoza.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d7e4729a0063fa33da08494078c06638/49833491137.pdfIn PDF document text
- http://www.tomasjelinek.com/img/pub/file/66676786388.pdfIn PDF document text
- http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/hm82r87qf7gsps2duq0vq1dm75/32343988327.pdfIn PDF document text
- https://hssanesteban.cl/files/dedinitepopisilomalizure.pdfIn PDF document text
- https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6cb8c95f7---momotaga.pdfIn PDF document text
- https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/21366731aae57ef27c5b145405220916/58124984467.pdfIn PDF document text
- http://ajivikafinance.com/userfiles/file/68946911731.pdfIn PDF document text
- https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bff47a1a0f9---20098916659.pdfIn PDF document text
- http://sewakendragroup.com/userfiles/file/83232781557.pdfIn PDF document text
- http://ximangsongthao.com/app/webroot/uploads/files/xejegiduvejaro.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=knights+and+knaves+puzzles+with+answersPDF link annotation
- 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_off0000f6c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6C4	17932 bytes
SHA-256: `2a66beb7ce5cbc8b35146dc102700c169fca9197cccaaf6cdde44cfe5816a02b`
`font_01_sfnt_off00012631.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12631	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013e48.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E48	10948 bytes
SHA-256: `3fb8565dea51fa158ff49afc3f76501c7d9957b5a8e82bdefd8b95c5a1f29dbb`

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