Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ea42245534f5be…

MALICIOUS

PDF

70.8 KB Created: 2021-09-20 02:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95c0347536e41f42505eeab0bc940732 SHA-1: ad5e86e511d00b19493d1c4a93006687caeddf9a SHA-256: 03ea42245534f5be092cae2aaf6ee64d8020a437b3ed8cd070206352e0d26649
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The primary lure appears to be a fake download link for 'photomath premium apk free download', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=photomath+premium+apk+free+download PDF link annotation
    • http://alwaysshine.com/fileimage/file/vesotalapolumowok.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/63078182276.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/mefuranibuvanevatabipemup.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/movujizafedat.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/zizularunubi.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/37521082177.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/oaf9jr75d8m345ensfa8phi2lm/webukavazivob.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/motodorogabupuvuteser.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/najilugiziti.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/9791737902.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/13315456329.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/42920323904.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/nagivikezesuw.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/08/nunenubovego.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5517ed4175444a33db242651ed81b960/gowifo.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/76518100111.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/78226740660.pdfIn PDF document text
    • https://aksusu.com/upload/files/remupabak.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c45159fb7---27891341305.pdfIn PDF document text
    • https://cet.sk/res/file/pozozidawevenutinemosugaj.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/38369561874.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/88253154311.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/saluxazu.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/24808679904.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/38478164996.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.

FilenameKindSourceSize
font_00_sfnt_off0000b639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB639 10872 bytes
SHA-256: 4b8423aa1717f7e53182c748f25646a9850fa1e28206fc8c47e677ab8136e338
font_01_sfnt_off0000cf32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE744 15324 bytes
SHA-256: ba146442bc470c52b0a63429f8e288857269fdc7b1f8aefb4f1a7f8e1d593871

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