Malicious PDF — malware analysis report

Static analysis result for SHA-256 81346138a18c74ab…

MALICIOUS

PDF

93.0 KB Created: 2021-06-30 02:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 59702a56da340e9380acc7b232a27751 SHA-1: 4b9ea967055aa3d3508f8224c2b60270365f62ff SHA-256: 81346138a18c74ab048197891e9d486eb2aeafd3eab618857238bae4a4e56544
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting domains. The primary purpose appears to be directing users to external, potentially malicious content, leveraging a technique often associated with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://ambient-interier.cz/files/files/65503370999.pdf In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbce85dd1e---zitoposevidepe.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/44077636458.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bv8qbfosdkob5dedvedkramgm0/juvufididosivelosi.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/49367181954.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/vusidixalisuwojedolinuxuz.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e148e4499---95297138297.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/89234648229.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/92787759569.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c52624cf72f---negopumekolel.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/fopab.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/rolomek.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c360655afd568149ed08fd5f6a86b089/17707339265.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/5b33ccdcfaaac181367310b8beba19a8/zunajeti.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160beb2b790434---36891950837.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/bobiguju.pdfIn PDF document text
    • https://schmitz.cz/res/file/59398696371.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/28fdacc3f78864e23f877a861b5b7a0f/tomivi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e1019a53ee397fd0f5d7e38ff6d99418/73621922850.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/54bbc1383d802b60ef3bdaedabbc1b26/pobejuxenuve.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba940036e3---modijasefanemixamom.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4e349e39e473161aa16fdcbf44d70aa3/24284005941.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7540sbfip7juhibcbi4qj5atlg/mudukajomasusuxumudiwenuj.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/zodamupawuliwik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=harry+potter+movie+the+cursed+childPDF 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_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 17988 bytes
SHA-256: 8ba4211e2a93541bebda30216dc366846589174ef1db1255ff670642696e2f02
font_01_sfnt_off00013502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D19 10944 bytes
SHA-256: 8c21439ce74738e706de5b8628e29d45ece83bbc5de182df7beecdd4dca252d7

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