PDF malware analysis — malicious · 188eb00970d43ec9

MALICIOUS

PDF

87.4 KB Created: 2021-08-30 14:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 9b2634771bd2c1c2943520017f8b18fe SHA-1: 11f49a5c7789d8d0809e9bf496374113635a1e9b SHA-256: 188eb00970d43ec9cbc66ea6c345c23cb3bb51d46ad326899b43110711d22f25

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its role as a lure or distribution vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9873

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://ketchas.ru/uplcv?utm_term=conditional+convergence+definition PDF link annotation
- https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/fofon.pdfIn PDF document text
- https://www.kindspring.org/inc/ckfinder/userfiles/files/dipolalodedak.pdfIn PDF document text
- http://afslab.asia/upload/files/89002459334.pdfIn PDF document text
- http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160836ae9a93a2---motazajosupukawexukezib.pdfIn PDF document text
- https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/dexazarirazawujemu.pdfIn PDF document text
- https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/sjss89oc7hngs21qgee5f7j6d1/wovobewavofiwewagoderi.pdfIn PDF document text
- https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/34083792864.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ds0e68ggtfgkjceejlrs9gmksn/migidij.pdfIn PDF document text
- http://kochi-mimoto-iin.com/TakamatsuClinic/userfiles/file/62474173506.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083cca3314d1---53246191903.pdfIn PDF document text
- http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba70020e8f7---sugupagiwefopu.pdfIn PDF document text
- https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/1404ca9ad0f689b54bae273b0c0cd985/pewonuxewumenuke.pdfIn PDF document text
- http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2b3a00496---29837790714.pdfIn PDF document text
- https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f640190e21---tigeka.pdfIn PDF document text
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/79b208d396b7b03cd91656927b8c45d4/pibewinulowupipojefezaw.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862f2aae4df---34913993693.pdfIn PDF document text
- http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612197b029243---patasakikazatujida.pdfIn PDF document text
- https://btegypt.com/file/sewiza.pdfIn PDF document text
- https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609938cb076c5---fowisijub.pdfIn PDF document text
- http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/voxajutugerubege.pdfIn PDF document text
- https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0eda06f9bb1a02f57267def750cebef8/41170704637.pdfIn PDF document text
- https://hopclickhospitality.com/scgtest/team-explore/uploads/files/nureretarepasefixijoriga.pdfIn PDF document text
- http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/sexulinoromujemurozigega.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f68eb86bbe754d2edd60613b681f287a/sizabop.pdfIn PDF document text
- https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607215482c20e---12731688855.pdfIn PDF document text
- http://mikailang.net/userfiles/file/20210509125520_256956044.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c941486aee---84952612899.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_off0000f05e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF05E	17900 bytes
SHA-256: `35229d7356654fc66c0be93d081252efcc54c72d20981bfdec2bc340d4aeec26`
`font_01_sfnt_off00011e52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E52	10580 bytes
SHA-256: `a11c252e30f65162b83d111b59981f73407dba18531355fe8b598b7572e6f9ea`
`font_02_sfnt_off0001366a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1366A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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