PDF malware analysis — malicious · 8b656990443d0f55

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 05:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 016dcdbd3040cc22b2fae63603c5127a SHA-1: 60e2c734bec37075eda0cd76549f9e23246dfc83 SHA-256: 8b656990443d0f5512c0af28aa280aa9f1039abb2680e5d7b765e964e141d15d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains. Heuristics indicate these are likely used for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF being identified as a phishing trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://chcial.ru/uplcv?utm_term=gamer+birthday+gif PDF link annotation
- http://tunapvietnam.thietbiotoviet.com/Images_upload/files/12233047644.pdfIn PDF document text
- https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/550591598.pdfIn PDF document text
- http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumopadinamujas.pdfIn PDF document text
- https://dichvumayphoto.vn/webroot/img/files/21534693012.pdfIn PDF document text
- https://cupanghitam.com/contents/files/bepibidujanoxo.pdfIn PDF document text
- https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/nudikofiroweveka.pdfIn PDF document text
- https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/8v0mntqp9j8r1aafac8ckhndbl/xofekitegajofe.pdfIn PDF document text
- http://dreamscar.eu/userfiles/file/nasenopaledusoxulilanir.pdfIn PDF document text
- http://panova-art.com/files/file/7883417710.pdfIn PDF document text
- http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161315667ea7d2---61852960667.pdfIn PDF document text
- https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/bc2578b96dfbd7e65164f5c19cea1338/darekavufodir.pdfIn PDF document text
- http://asqcert.net/files/files/90683031450.pdfIn PDF document text
- https://tw-itemaos.com/ckfinder/userfiles/files/94263955738.pdfIn PDF document text
- http://dobrejaja.com/Upload/file/pavovo.pdfIn PDF document text
- https://mimpiindah1.com/contents/files/51809292589.pdfIn PDF document text
- http://artemon.nl/userfiles/file/82864909071.pdfIn PDF document text
- http://lednotice.com/userData/board/file/1773487916.pdfIn PDF document text
- http://lesbambousbleus.fr/ckeditor/upload/files/80544537109.pdfIn PDF document text
- http://aow.infogestnet.it/ckfinder/userfiles/files/35147925894.pdfIn PDF document text
- http://9275522-travel.com/userfiles/file/58784017038.pdfIn PDF document text
- http://everest-c.ru/ckfinder/userfiles/files/27699133425.pdfIn PDF document text
- https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/04j3rplsm7ja354pc5ta2dn17j/medejifupela.pdfIn PDF document text
- https://ww150003.linebot.net/upfile/files/20210906171716.pdfIn PDF document text
- http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131d76845159---40291120274.pdfIn PDF document text
- http://remproekt-m.ru/admin/ckfinder/userfiles/files/kepazatet.pdfIn PDF document text
- http://delfosventures.net/userfiles/files/kugibuvuzawujusunulixoma.pdfIn PDF document text
- https://jatransfer.com/userfiles/file/12889523611.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_off0000db58.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB58	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f36f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF36F	10656 bytes
SHA-256: `c4a1fb3e9b8c3f1dfe81e30cb1a4e7f49453995063423db891a7c7198ec69415`
`font_02_sfnt_off00010b9d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B9D	18832 bytes
SHA-256: `dcedfb27a482aad8ab41262add39a31491b8bace2bea4b7c01d276d4df2df8ac`

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