Malicious PDF — malware analysis report

Static analysis result for SHA-256 0427c74a03340731…

MALICIOUS

PDF

90.2 KB Created: 2021-09-06 23:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 473a9fb6416d88d627f2370f54aceaf2 SHA-1: 4168398680c2bdb47e7e490b1e26ab8406cc70b6 SHA-256: 0427c74a03340731c87ebbf8e05ca5edc69918e8e228da85642961f629d7d104
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories. These links likely serve as a link farm to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 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://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a497dc3c6---xiduxavuzexo.pdf In PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160db198db5ee6---39726657371.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/duzeterafufodidolem.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161292589ec8c1---39533173400.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/lupudutowupetidibomone.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/vuxazizorolikifojuzovudop.pdfIn PDF document text
    • http://walker-doss.com/clients/4/45/450b4a4af5ff3f13851793278d9c7ef8/File/61403064610.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/gitagiwene.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d9c3de2e5---62785624728.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/13562645700.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6b6fdb39b33b37bb5e05011ad537c5ff/18758804494.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suwinuvi.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/96132939399.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/16043143144.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16107fa244b562---47754053101.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754d6aa59b3---megogalisugutebugu.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/vivepilexekefosowow.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/nepenul.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/pomiwaru.pdfIn PDF document text
    • http://slsnn.ru/content/files/8229278530.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/jovuf.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/sonubiretakovirof.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c163df784---nadekovudupenudajej.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/bidalolasudovibupupebena.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/wutiwibarojelitedepasa.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080bdce12b7b---mizurinajimarigejivixuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=vizio+40+5.1+sound+bar+system+manualPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 18348 bytes
SHA-256: 21c297f3c44c44d7b39766f0960bdf750e8e87419c0d11c92a3e4c3f48b4f172
font_01_sfnt_off0001280a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14021 11244 bytes
SHA-256: 39fc823171e27dbbf25d997802d951ac9edb00a1a13ef384cc7821b371a1e9a9