Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f4d3e91b691038…

MALICIOUS

PDF

88.9 KB Created: 2021-07-02 01:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9491cfb54c16f4745e87b897726bda68 SHA-1: 0a1cd9bfd81cb9641b8c2fa23b0bc9a9d9d43ba7 SHA-256: 82f4d3e91b691038f76694797f52bb579645f1a2d791e6d1d7d223fb21edd520
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=fairway+solitaire+unlimited+play PDF link annotation
    • http://zaun-produzent.de/userfiles/file/xatejogafim.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/eb9008e6192fc5e185d2f5e7c923873c/mefomogezidi.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/d8p1vr6756o3605q4blvntgsot/kenavexejiwemenirafu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608181ac9429d---81123375551.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/duzalipinudano.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/60570194568.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf90ba30d---89747485810.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/razebunuzixojanoj.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/1248c619a4237b869168277fe201d062/zexiralarukejodaxefeb.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/26591196148.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/9ns4tng9odu3ehdf8gih5pus4r/55978273905.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbafc8d5fc---jajiwejixejelolo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a411f66e5c---83703591566.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082824e2e174---zevuveguf.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/xisaweraxikegagevezava.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/03c0eb3fe31ce15abf0c2ef21c8ff221/genaton.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/18219094981.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca0fe28240---jokitete.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/b123180b543869bdf0026f9f121d08c1/35025644642.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/64392482511.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/9dca17d79db1a7a7ce6073f93060d5ea/45159498821.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/87221588525.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/gidititutixedodanip.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5b53af0e---sozugab.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/dovol.pdfIn PDF document text
    • http://alkanboya.com/files/file///70736486164.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 17616 bytes
SHA-256: a44e14ad0353743d51189a3c3e06fb9c64c40ea2c840003e417caa0cec7d4c19
font_01_sfnt_off00010d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AC 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off00013b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B23 10832 bytes
SHA-256: e74e9871f7c3f4daf88e1122ed13e03dc006bf24ce90ba541dc5d7ea7292fd24

Open this report in the interactive analyzer, or submit your own file for analysis.