Malicious PDF — malware analysis report

Static analysis result for SHA-256 758ab39745e96042…

MALICIOUS

PDF

75.0 KB Created: 2021-06-26 00:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 405f108b6fe2f62764da4486f23bb777 SHA-1: ecae4448687d46cd36f442be50dbc8cf4b1e77e1 SHA-256: 758ab39745e96042c485b074ab3d40bd99350320a6a834d8a7dd6ae8cb491b91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The document contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external links and the high risk score point towards a malicious intent to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=most+realistic+minecraft+pe+texture+pack PDF link annotation
    • http://suamayin.biz/userfiles/file/75138876532.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/dso8l1991c6ofbp118o4pn4g33/93708473401.pdfIn PDF document text
    • http://marymo.ru/uploads/files/42623204857.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ab7a0e87---bupipuvoratununipo.pdfIn PDF document text
    • http://sparkpro.lv/content/file/40074430255.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/pozubizokilosezugemilulib.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/75p2fvrkf18c8le6r53ekqncf1/labefej.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/0bm8qhm8r9p0pn05atb68auqg8/wesume.pdfIn PDF document text
    • http://skomi.ru/img/files/file/12041137166.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ailb5sochos862to63l7i59ef0/92308550804.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/69078011500.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/5680496367.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623185565.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d53fdac9b4e---21350015573.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072191194168---17177258127.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/wuvavuwovupajox.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072795de145e---peparobinisibilaxajuruwop.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d259ec278c7cd2a4fb42fc16cf0cf6da/38297304265.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rikepokotevegodon.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/84377495598.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608842d64cfcb---muvawozivejamuxupemeteju.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/lifivuwefoka.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ec368faea---87083728042.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_off0000bdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD3 10928 bytes
SHA-256: 61ecd77ae9c69a324951f07060122f9a12c67d63527c9f8f9ff96a06d04b882c
font_01_sfnt_off0000d72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 18416 bytes
SHA-256: f2eeb89208b682b179ffc2024f33005589203eb592183f6a73da274f73cdd37e
font_02_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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