PDF malware analysis — malicious · 2176e478db80ad25

MALICIOUS

PDF

85.2 KB Created: 2021-07-06 22:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 3b5e9e72d4808897c88f3a5f4feec071 SHA-1: 6e213bf522065576fcb2c6a99d6a97a7aad4f3e7 SHA-256: 2176e478db80ad2565fc83c1b7e16f3a187c0839367ccdd34778a788b8212e82

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that the document is designed to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://drafthe.ru/uplcv?utm_term=accuracy+and+precision+worksheet+answers+pdf PDF link annotation
- http://fsanaq.com/upload/file/210623201344611377uw7pyayapv09.pdfIn PDF document text
- https://brickbodysupplements.com/newerac2c/userfiles/file/lapevu.pdfIn PDF document text
- https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16081e5a16ac27---rexokaxibilik.pdfIn PDF document text
- http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b1bd03c9c---nulubusujowuk.pdfIn PDF document text
- http://expresskaliski.info/file/40366165110.pdfIn PDF document text
- http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/sirij.pdfIn PDF document text
- https://adasms.fr/userfiles/file/5326643169.pdfIn PDF document text
- http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608825a436af3---10502270473.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b33002c02f4---46128844309.pdfIn PDF document text
- http://3colorjazz.com/fckeditor/userfiles/image/potanezir.pdfIn PDF document text
- https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e312445879a---73203601164.pdfIn PDF document text
- http://sciattella.net/images/file/jumiraloxasowoweferogetaw.pdfIn PDF document text
- http://asvpp.fr/pdf/tebazokizuzenotipoxenupum.pdfIn PDF document text
- http://kalikraft.com/images/file/26761736346.pdfIn PDF document text
- https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/vtfgp6m1bdu6bpb82b2l7ap0m1/joketimibitogixenuwodat.pdfIn PDF document text
- https://clap-bas.com/userfiles/file/wobedavibidaratitiven.pdfIn PDF document text
- https://asset-books.com/userfiles/file/tosowolebifimilov.pdfIn PDF document text
- https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/a20b39f1520f56df97c26da689861376/fonobew.pdfIn PDF document text
- https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/e7gknibfsqp2ltr23avi341fc1/wevodigemeno.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160803b5fc637a---4977021873.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9469ee4fd---54086066313.pdfIn PDF document text
- https://tucarrorentacar.co/ckfinder/userfiles/files/firozisusasaragojo.pdfIn PDF document text
- https://rivnerun.club/images/files/punerafavitanane.pdfIn PDF document text
- https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6unap30q4tsdt836c1d7oo8nel/29591472939.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf353772e1---narizelimirilirufip.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/2fquvpf139krae6g0akrgpqqj5/guzekowedugopepabosofi.pdfIn PDF document text
- https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/181ee4aca784afeaf4d153ed264e6bad/78298584749.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_off0000ea3b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA3B	16616 bytes
SHA-256: `8a18a0b0285961bffb4dc5316f9950418a42f1412bd2f242c3675dce05c41463`
`font_01_sfnt_off0001152d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1152D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012d44.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D44	11044 bytes
SHA-256: `e325adf979e323c499a0d72a1ea9ec2fa2d55cef71afdaf5252d2f3c8d1bc34d`

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