PDF malware analysis — malicious · 2fd8727022d4a40a

MALICIOUS

PDF

74.5 KB Created: 2021-08-19 22:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: d3150f311683099fca9b1f27a6eb8b39 SHA-1: 1463a223d4113a343f1afe62040d21282cabcfb2 SHA-256: 2fd8727022d4a40a891c323f3c1f15b930bd2da9836f778c3c8b6eaffde3bf2a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to potentially malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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 https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/37d6f755d4ae72ae173c02469f4a2f2e/fivis.pdf In PDF document text
- http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866b693a3a1---66316488234.pdfIn PDF document text
- https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a2f91918cb714fa4deb0fc15a47904ef/denemino.pdfIn PDF document text
- http://shortguycentral.com/ck_uploads/files/62226470204.pdfIn PDF document text
- https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d4824fbcf94e5ada0a0087d6353ad9b1/19371719233.pdfIn PDF document text
- https://hansenlight.com/UploadFile/files/56984030948.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a913d6b9956a0e3a9ceb36701f0b929d/rajelutazilawowafapi.pdfIn PDF document text
- https://economiadecomunion.com/ckfinder/userfiles/files/6402994683.pdfIn PDF document text
- http://tinhdaurosa.com/Images_upload/files/borobabesifaratu.pdfIn PDF document text
- http://akwarella.pl/user_uploads/file/85831183259.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/95p3nrlm4hp6rutu7e1dtjetpp/15502436229.pdfIn PDF document text
- https://accuratesearch.com/userfiles/file/xerizisemevexibig.pdfIn PDF document text
- https://healthmatters.me/userfiles/file/mugexo.pdfIn PDF document text
- https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4b22f84132260eabed65a287b56121df/luvup.pdfIn PDF document text
- https://pfhotel.gr/ckfinder/userfiles/files/zugavexigumunir.pdfIn PDF document text
- https://lysgaards.com/ckfinder/userfiles/files/lodowojubijemunaginiso.pdfIn PDF document text
- http://shinies.ru/img/lib/file/9660261038.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/35d99f1bc5cf33acf69313e53b551aad/42596074545.pdfIn PDF document text
- http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb196923109---rikasizalag.pdfIn PDF document text
- http://sakaryakasaplarodasi.org/userfiles/file/33352988168.pdfIn PDF document text
- https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cce6d9e36---31180020113.pdfIn PDF document text
- http://taxfreepoint.com/file/ditimanibodurela.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4d4ac2d1---tidopetejozi.pdfIn PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610a67927530f---76181243005.pdfIn PDF document text
- https://artbynela.com/uploads/file/zakutewefeli.pdfIn PDF document text
- http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608726e37c641---37433778921.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=biozone+answers+pdfPDF 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_off0000c2d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC2D4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dae6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAE6	15736 bytes
SHA-256: `ab17c11dbfe5b38d5d9946b81dc2c3b3311a71e9320791667ebec04ebe538ad1`
`font_02_sfnt_off00010371.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10371	10544 bytes
SHA-256: `4757936617ab1f7e6db6e9c2d00176e33ba4804bf3a51f5442089aab05da7340`

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