PDF malware analysis — malicious · cde9f28444f3d097

MALICIOUS

PDF

88.5 KB Created: 2021-09-03 13:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: af4dc64a21a6cae6beb84881531f9c1d SHA-1: be113c0ea7211683220913e7f840bec5dda46ceb SHA-256: cde9f28444f3d09768421ea8a1d9c68e3bf89e28db98519d567ec3db9dfc0b00

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the PDF structure itself are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9764

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://pistant.ru/uplcv?utm_term=koselleck+futuro+passado+pdf PDF link annotation
- http://debschoen.com/userfiles/file/63579462615.pdfIn PDF document text
- http://www.urbanwaterways.info/files/45965657612.pdfIn PDF document text
- http://keletunderground.hu/images/uploaded_pics/file/31950788661.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160901a2be01ac---62690232182.pdfIn PDF document text
- https://mygoaltv.org/ipp/images/uploads/files/jeganap.pdfIn PDF document text
- https://bda.ch/ckfinder/userfiles/files/76772180841.pdfIn PDF document text
- http://penney1970.com/clients/7/74/747debde904cce1d9d58e62e9103e361/File/watofakunumezit.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3214d5372a---nimoxusidoridareki.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc5b69be7e---mimaritijarofiwekofijat.pdfIn PDF document text
- https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/4246e616cad07a3c039136ff11da21c0/tikudupubowozuxi.pdfIn PDF document text
- https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/nirokoj.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792b4b94177---63056940599.pdfIn PDF document text
- http://minhledtran.com/luutru/files/bezazenugizelajop.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/06a7ea234b1c084770b6dfd7743ffbba/26382203317.pdfIn PDF document text
- https://sonntag-immobilien.lu/userfiles/files/tidegetiwumonazoxe.pdfIn PDF document text
- http://hanlacsclub.com/ckupload/files/65979434443.pdfIn PDF document text
- http://gutachterbewertung.de/userfiles/file/75494852042.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609416e2ecbea---47738038947.pdfIn PDF document text
- https://go2germany.ru/files/file/43329579657.pdfIn PDF document text
- http://finpacecuador.com/userfiles/file/23519954942.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075c88389366---fimiritekubazen.pdfIn PDF document text
- http://cbgnfinance.com/userfiles/file/zipago.pdfIn PDF document text
- http://boldino-hotel.com/ckfinder/userfiles/files/silizefovedotil.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160980c314d647---wawaxozewefefita.pdfIn PDF document text
- http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d30a085cd---48526014242.pdfIn PDF document text
- https://petek.biz/resimler/files/58604311317.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_off0000d9ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9AB	17664 bytes
SHA-256: `511179dca1dd26f4d6f0ecd76fb9227cfe2d006d3232096a2703e1563ea4ffec`
`font_01_sfnt_off0000f4c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4C6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010cdd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CDD	10600 bytes
SHA-256: `2107843dce76e735099f9d6e228796bc4e1068829dd6ff1509b23a2d76c9b9a7`
`font_03_sfnt_off00012546.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12546	17756 bytes
SHA-256: `cc01022b3ba7e661c9c0895a0598eea6b2e67857fb390d7f1a704a01a87aaf20`

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