PDF malware analysis — malicious · 53f3361b9ac7ebc2

MALICIOUS

PDF

82.6 KB Created: 2021-07-13 19:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 6f838110509d616af7e9684f60204767 SHA-1: 0a923f49706d7a2894354d054bd3ea21aae1c938 SHA-256: 53f3361b9ac7ebc25d027ed2dde70319412c4aba7a54907ecb111a9f37f409f8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as a distribution mechanism for further malicious payloads or phishing content.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/tpje7v9jon0s4qp1p8m8mbc0ek/81165909018.pdf In PDF document text
- http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cfaeede3b---47443823250.pdfIn PDF document text
- https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f072e2109c0d3969b82e723afae6c558/33023519711.pdfIn PDF document text
- http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b82d9411c50---tasolanususofaramex.pdfIn PDF document text
- https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8qhh4g3a3oha5j0mi4ptngnni8/40295227657.pdfIn PDF document text
- https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/95620299468.pdfIn PDF document text
- https://thehero88vip.com/ckfinder/images_store/files/vupemejavod.pdfIn PDF document text
- https://aartipalette.com/userfiles/file/70128297500.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891282483a7---nawipuromovexategi.pdfIn PDF document text
- http://studiomuraca.eu/userfiles/files/suxokikufedovojizopudoxud.pdfIn PDF document text
- http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca9834f0e---lebuwa.pdfIn PDF document text
- http://edgecs.net/documents/rubulon.pdfIn PDF document text
- http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a3079ee4d---lixiraja.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/55c560ddec39660ca73c213a6c6a760a/40967826793.pdfIn PDF document text
- http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608224058bb2c---kamoxazukoxazaxumidoko.pdfIn PDF document text
- http://myshopgroup.com/userfiles/files/75432258663.pdfIn PDF document text
- https://aravlicraft.com/cmsCart//upload/file/34597095310.pdfIn PDF document text
- http://studiocalderini.it/userfiles/files/59395242637.pdfIn PDF document text
- https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e650850ae13---74963915628.pdfIn PDF document text
- http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14095725256.pdfIn PDF document text
- https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/4f7fec954f032195abca0edc8c6c6848/xelinikujejunikipopotesi.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160855b6de4809---bosusobugofimoberuve.pdfIn PDF document text
- http://softwarefactory.nl/images/file/40503698490.pdfIn PDF document text
- https://golf-tout-terrain.com/publish/page/file/ninapemodidigojuno.pdfIn PDF document text
- https://bimstudioinc.com/media/files/bagupazexudetisat.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077940fd0426---80426558167.pdfIn PDF document text
- https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/4b46d8541c52a9842e51c5a324224a17/35049735094.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=jee+chemistry+questions+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_off0000dc03.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC03	11028 bytes
SHA-256: `7cd03870ee52bf0291d52c2866a077ff89c1f1da5dbb050a4cc66d0a5557b606`
`font_01_sfnt_off0000f553.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF553	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010d65.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D65	17848 bytes
SHA-256: `31c313297021d7d8282f442558c75b540e9122cd1f83cfd7fb50dbc6e708fe9d`

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