PDF malware analysis — malicious · 77fc140df5a5f12e

MALICIOUS

PDF

119.0 KB Created: 2021-06-27 19:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: ec29d8b97e2d8418b595434348f027f7 SHA-1: 7848a90b47c00fad1db5961861287e42a2416d66 SHA-256: 77fc140df5a5f12ea802f9f9c24580840129b6bac7c9e3dbaafc0d8fbe10e36b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially track user clicks.

Machine Learning

Nyx PDF Classifier malicious score 0.9944

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 http://3e-recycling.ru/app/webroot/filesfiles/bufulekanavalunonakox.pdf In PDF document text
- http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca125a61ea2---61662931018.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a97224b5bd4---3897702995.pdfIn PDF document text
- https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/6f145dc2d8189e5a21562c3a2579c544/90336997575.pdfIn PDF document text
- https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/14f8cf1ef98d26bc8252930799ec34ec/90833003997.pdfIn PDF document text
- http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4635d0c0b---42515827097.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab05ea4339---losafagabep.pdfIn PDF document text
- http://highendschmiede.de/highendfiles/file/11900419031.pdfIn PDF document text
- http://congtydaihai.com/upload/files/87391244528.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823a1587808---35341707979.pdfIn PDF document text
- https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/10eafaba08b4db1b140e54be8158e86c/vixotonifuxaxodax.pdfIn PDF document text
- http://2ds-creations.fr/userfiles/file/xupige.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/880b5c9cdb6588074dc1ba6514ac42fb/lavizazanugep.pdfIn PDF document text
- http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097705597d92---3750033339.pdfIn PDF document text
- https://digireg.se/upload/vugozukikisu.pdfIn PDF document text
- http://budoprojekt.eu/obrazy/file/xusopevavixezozeketuw.pdfIn PDF document text
- https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/509ca736c66a815535f75772e9b18fc2/13178746283.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7335a1388625667a91c6467ca36b10bf/11031685294.pdfIn PDF document text
- https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/66f9bb9c1329dc0a4d07462bc798cbdd/60023329735.pdfIn PDF document text
- https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/48be26e11aeb3cfc256b13afef6852c6/joboweka.pdfIn PDF document text
- http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbbddc30f0---10695965337.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e9dacc29a90699c063511a2490fbc862/jubesa.pdfIn PDF document text
- http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfe96d04d3---4134073005.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=do+barnacles+hurt+whalesPDF 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_off00016d6d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16D6D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001857f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1857F	19480 bytes
SHA-256: `dd88167c4270270a5f5ca7cbb1c4defeed90898d130cbaa3645d48b07de6a24f`
`font_02_sfnt_off0001b6c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1B6C6	10564 bytes
SHA-256: `abbd186b38332514f721ffdf054969335d3fc0c411e66a387b32e41bab09ad06`

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