Malicious PDF — malware analysis report

Static analysis result for SHA-256 143405d485d4ed2e…

MALICIOUS

PDF

69.5 KB Created: 2021-09-13 04:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc670d3ff8dab704960f225a93f74d72 SHA-1: 94d388ce41415b68679ec2d3fcb7806f8aa1eb16 SHA-256: 143405d485d4ed2e7f8e9ae6cbf547450bf423cffdaeaee2075be1350b558814
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised websites and potentially disposable hosting. The embedded URLs, such as https://laborke.ru/uplcv?utm_term=how+do+you+unlock+an+iphone, suggest a phishing or social engineering lure, likely to trick users into further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=how+do+you+unlock+an+iphone PDF link annotation
    • http://sterenstein.ru/userfiles/file/58552925664.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/db75f53cc4d6547c1186609ada38f3f9/nunejokaxajewetizipugi.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/suzuluwasiloser.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/guzex.pdfIn PDF document text
    • http://salwex.hu/file/xipirinurupavi.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613755e1e3614---fupixejumotunikuzafevimib.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/bozupewisiwesezas.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/64188314746.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/uib790utq07lnrbl4q8o4i79qf/68831487124.pdfIn PDF document text
    • http://marymo.ru/uploads/files/8122148598.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/85587374671.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335e5d54064---49778812468.pdfIn PDF document text
    • http://speckrepej.com/upload/file/vakulasuratubavop.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cdde46aff1db006e4c814795f8c5e5d8/99781774264.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///49350338382.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/46451034561.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/6923223682.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/kalezikape.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/42227560477.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/supofi.pdfIn PDF document text
    • https://preciseenergygroup.com/media/47565935799.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/82942729397.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/zujitis.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_off0000b2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BE 14880 bytes
SHA-256: 70b189546d763f5f1dbd7efb512266448c06bfb6032f140379d977115a4b19d8
font_01_sfnt_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 10628 bytes
SHA-256: b16cf28589aa04d83d36a0d962c5569901f874fbbe7cdf2e9ec67247ff030451
font_02_sfnt_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1