Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62b708a29010fe1…

MALICIOUS

PDF

101.6 KB Created: 2021-10-13 18:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 92060504d2a9ee5765361fb36b6eb6f4 SHA-1: c0739416a125c0f6e6d122011e3bc59e1311e3f2 SHA-256: d62b708a29010fe11539d16c74a49dff3e871103568328aa5fe55affdfca5c41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised WordPress sites, designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point to a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=states+and+capitals+of+the+southeast+region PDF link annotation
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161305a18a818b---vilasekofuzip.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d725286b8---42702265222.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/kuvukarivelitisanoja.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/warevowepetisuf.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/24589137675.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/duwunem.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16143b675a88fc---73781221893.pdfIn PDF document text
    • http://teraval.cz/res/file/vipodilujoxu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16132044ab4fc1---92472365570.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/vijivetabo.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/93049774435.pdfIn PDF document text
    • http://selidbe-beograd.info/files/jipusejojunusegavoku.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vpgrkkppqnhe7tfj6u0g449tr7/wejiwenenixefudenusij.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/juturetasiwira.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e083d87e0c---14913907681.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/79405075585.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c9ca722b69dbf6626b34a8905048f89a/jigami.pdfIn PDF document text
    • https://primer-spb.ru/files/files/wakirotefaseso.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/zobakidi.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210911_922030744D5253E7.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/7826241177.pdfIn PDF document text
    • https://bep.semmelweis.hu/userfiles/file/80955063888.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_off00012166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001397d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397D 11072 bytes
SHA-256: 32ae9fcc8d37a4b45df4024cd3c3ceacdeb2ab373e9f78aaad6cde3ba5114ecd
font_02_sfnt_off000152f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F2 20324 bytes
SHA-256: 3571cc444675a22cf908a3621755e4d13f4004aee751dd1c04d328235be7034b