PDF malware analysis — malicious · 76dbc698e161d1c5

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 04:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 55b55916ddb9830d090e7e199e3398df SHA-1: 840a1b3589f278ae791b856ad759c25e8ad75ce7 SHA-256: 76dbc698e161d1c5a464aaed962ad9baeb75bb2373f4605870c9d69e4c90e25a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/4bbd44cb0e51c0928d381c3809558a50/vizabipek.pdf In PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rs1kfh4l21arrle78uopjlnkrc/29887288420.pdfIn PDF document text
- https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/0tgjm91qcgd777m1v2cga7i4hl/tuxuguze.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/81426167001.pdfIn PDF document text
- http://jumpinfit.it/userfiles/files/jogemanovidevaxenibe.pdfIn PDF document text
- https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/0cca1394b3eb1d10509194300208440b/vumojole.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e88658606143c0091db66fa784423757/xubezes.pdfIn PDF document text
- https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160faee3661b1e---9754801291.pdfIn PDF document text
- https://kcharp.com/ckfinder/userfiles/files/bajakeweb.pdfIn PDF document text
- https://goldmenu.com/userfiles/file/53744995087.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d33678be8b---23838257201.pdfIn PDF document text
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78636e2b84---25936839142.pdfIn PDF document text
- https://thegioibaobicarton.com/Images_upload/files/rinejijumo.pdfIn PDF document text
- http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/biwaxunevugexin.pdfIn PDF document text
- https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7c04224e4844a21436af4a1896462ad/42768866863.pdfIn PDF document text
- https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0db7adfdf64017081eeca71f66aaad29/mosataxoxer.pdfIn PDF document text
- https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/f5a005fba7cc37ea6ead533901e9a928/43413677513.pdfIn PDF document text
- http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/pofogipunap.pdfIn PDF document text
- http://rococosofa.com/files/files/nudugifeputorukexexux.pdfIn PDF document text
- http://avs-market.ru/admin/ckfinder/userfiles/files/40731706093.pdfIn PDF document text
- http://tkhomedeco.com/assets/uploads/ckedit/files/20210623010117.pdfIn PDF document text
- http://ricarda-allegra.de/userfiles/file/jumesupazarunurijur.pdfIn PDF document text
- http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb8ae6c87e---40228941853.pdfIn PDF document text
- https://hohsingfiber.com/ufiles/files/toxumafafenekiwexip.pdfIn PDF document text
- http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612d33b9c8d69---giwunupipopenun.pdfIn PDF document text
- http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130152b718f8---19552144220.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+give+someone+op+on+minecraft+serverPDF 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_off0000e517.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE517	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fd29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD29	19164 bytes
SHA-256: `95780a4886fba5c83f2f7e7c888049cb47ae84138edd2a4f3c77ba44206301c5`
`font_02_sfnt_off00012ef5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12EF5	10920 bytes
SHA-256: `8fe9d2a35f4015918968c416a0764dcfba34b49d6b180df7f0069dcc8e2b2350`

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