PDF malware analysis — malicious · a9af0cd753677b81

MALICIOUS

PDF

90.0 KB Created: 2021-06-25 20:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: 5228b1a2806064833d57e5b10d37775b SHA-1: 0f83fe9f38deb60eec09e3e6718cb08a9908864a SHA-256: a9af0cd753677b81d6b78c2885deb70c436ee306b02bc806eb93237c3d6a53e2

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that these links are likely part of a malicious campaign, possibly for phishing or distributing further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 7

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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=who+is+the+goddess+of+witchcraft+in+macbeth PDF link annotation
- http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079e390cfb4b---goxere.pdfIn PDF document text
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/0d981d2cc1d4c9fb1f6a3227e25841b8/bovomelelasiwizefex.pdfIn PDF document text
- http://sparkpro.lv/content/file/zosemadefajamaje.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0712234639---23858077786.pdfIn PDF document text
- http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b22159045fd---50216228930.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f182f260---46583180033.pdfIn PDF document text
- http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57484c0f06---veluxexulisavagupiwojor.pdfIn PDF document text
- https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e0735ba44343e53df5208697e1286cff/53096979006.pdfIn PDF document text
- https://preprodpcb.com/userfiles/files/filoxijowoxibaredumimaxo.pdfIn PDF document text
- https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdd678860c---80581058292.pdfIn PDF document text
- http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942b88996f8---65786878915.pdfIn PDF document text
- https://louvre.lv/res/wysiwyg/file/43493134908.pdfIn PDF document text
- http://mai-colle.jp/userfiles/file/suwor.pdfIn PDF document text
- https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/20d63a9c99cd16575811598c0eb18f70/77401939163.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/273fb346ed55968425a43d77585d3aa5/zolidesa.pdfIn PDF document text
- http://uralinteh.com/uploads/files/nosibopizajivusoledowed.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc0e8ec1ff---delividuvuzopuwimax.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/8d0072bfb16ebc8a8fc654750f7a5c68/2207103480.pdfIn PDF document text
- https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0232a9rog4qrrein188hu3bi57/dimowuvafonupobomebewuxe.pdfIn PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4558712a7---wosavepipakudovuwosafojer.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/31c1af5a6281aff6517fafe0d5006cc0/kidigirizav.pdfIn PDF document text
- https://mimpishio2.net/contents//files/2202185317.pdfIn PDF document text
- http://eatatrudy.com/uploads/files/75852618561.pdfIn PDF document text
- http://marinapogon.pl/upload/file/64879243799.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/sld4tsniophcract93qrtb1fp5/67553139529.pdfIn PDF document text
- https://tvmreza.tv/ckfinder/userfiles/files/5809059599.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_off0000fbc9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBC9	17648 bytes
SHA-256: `9d56fa01e4697720ca6ae79bd3fc47383e0bfdb68c86cdf85c506599cd9c0671`
`font_01_sfnt_off00012951.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12951	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014168.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14168	11096 bytes
SHA-256: `a7f24a7d4e1f08135c3bb215df0ca05ecb9ec4e76d51052f689e0b4824adea46`

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