Malicious PDF — malware analysis report

Static analysis result for SHA-256 750ad3d1b5d36b62…

MALICIOUS

PDF

82.0 KB Created: 2021-08-10 22:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a189839d7b6a35fc08bc00a356f9537 SHA-1: 7e3051f90b7ee87e73546098ab14781e4c9cd590 SHA-256: 750ad3d1b5d36b6282e8b78407a1020e21745a8d7a719d900b55eb6b86a81aea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content, likely leveraging a PDF exploit or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=briggs+and+stratton+lawn+mower+service+manual PDF link annotation
    • http://zetrade.cz/userfiles/file/85237812902.pdfIn PDF document text
    • https://landi-bg.com/images/file/45635438780.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/v08foejhbr66me5gngdvg8p5e0/ralumerotujagogelim.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/zovapipatuk.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/mokukepefobigi.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/65895042147.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///kediwemodub.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/pejilabulibasa.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c5ad115fd0b2b5ea13f2d49ab7f7e258/34396638773.pdfIn PDF document text
    • http://calisnt.com/uploads/files/gejoxefurig.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/73040954635.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe99824a6c---dujavozurivuro.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/76146390323.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/1673115121.pdfIn PDF document text
    • http://hkalc.com/userfiles/39632732193.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ba05a40fb520031205732ca1efc990fa/xotadexofuzapixupi.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608769e037204---fekamajixofiganifek.pdfIn PDF document text
    • http://gyobel.it/public/file/43970388181.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c48f7c0863---movujufumedoxuxu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d5b9ad89---remezolefebewagotaxene.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e2498c8ea2e70945f97b15591e50a21c/55809091688.pdfIn PDF document text
    • https://baongochoa.com/upload/file/80500166906.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fc6e3c92432---wakugoruvav.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/34117002949.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a9152953463---duxopunan.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_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 16840 bytes
SHA-256: 3aa77d15e79e8103a4afe10aeb1c401ca23c8f179c3b6a35f3c841e637a8120c
font_01_sfnt_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 11016 bytes
SHA-256: f463ffb0e68d6c936e8f29f1682b96588a98cc257744c3222ac44f15ff5c5053

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