Malicious PDF — malware analysis report

Static analysis result for SHA-256 72729d7330f5238e…

MALICIOUS

PDF

68.0 KB Created: 2021-09-06 17:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 24bc98802e65f33c9cb7905ab3d64e02 SHA-1: 7e0975645d0c16a38378d8ec1a440cd2f11a7b3f SHA-256: 72729d7330f5238e70c3005ceb9e2d3fe757c9147d5fdf0ae4c4da8deec453ce
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with a screenshot overlay. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://prestopc.it/upload/file/72220663819.pdf In PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609834aaae04e---14583885002.pdfIn PDF document text
    • http://ecole.ru/text/images/file/13689956831.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/lasemozibowu.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/98804320170.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021060200451873499.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/42094027799.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/71373422563.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/vifafimedi.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/9226febead6435b5aa4aef70f76164a6/11187834835.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/guxufofopofipaw.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fa5c606081---21193695293.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/63128063083.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/sonugapilakalojefamowu.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/tejadipederekunedexof.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/tb4k6jo7k9lgr279fjmmh4kr6g/dalufobodamapopugiz.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021072015183084.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/22226539621.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210821194227338815.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/95215807632.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/7470372262.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7ea43082---fusemapixijewokubuterezat.pdfIn PDF document text
    • http://simonide.org/userfiles/file/90304677943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=recombinant+proteins+pdfPDF 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_off0000af5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5B 14044 bytes
SHA-256: c5fb8550a80f76551e6ae57c7a5abef7f8358c6f86af142bb17f794eb561b3b8
font_01_sfnt_off0000d1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C5 10920 bytes
SHA-256: 2075fdf179470343928cca721c7e431a7d4b8c4260ceb72f190d661a0ae0c779
font_02_sfnt_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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