Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b1d611deddaa05…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 00:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc1ec772798efa59f4b373840b5796b1 SHA-1: c4ef1b2aecf0bb1420dc8cdc0ec3a8f19a90cd2b SHA-256: c5b1d611deddaa052266dfbc567cd204357847ad77d8ddca514c40ef094fbadb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, designed to redirect users to malicious content. The presence of numerous external URIs and link farm heuristics strongly suggests a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://archism.ru/uplcv?utm_term=factors+influencing+rate+of+chemical+reaction PDF link annotation
    • https://sanagustin.cl/files/zerojuladulux.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/14002477437.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210520005453.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/rugitabonorebamaloku.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a79d09b9f871b5f19c44546a0caefcb/97166150566.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/35510328369.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/dabuwuvuvedide.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/dalumefawiwo.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/65576480568.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5abd79e92f---pefixujobibotijijis.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097acd28a366---ximufisagedonujutoto.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41998baac2---kixemuvamuvodida.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/kaloj.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/3985110270.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/linonola.pdfIn PDF document text
    • http://wawa757.com/uploads/files/kunekiwaxozufidogaxub.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/tiwuvexufotigivumuselok.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/80469847588.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/rotesulurewinubuv.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a669a039e6d---batofapamiwu.pdfIn PDF document text
    • http://cymagun.com/userfiles/xoxuzariragizidogisalopij.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/lekomavarufusaru.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7dbfbc24b---95677913201.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/kupitepoxobovagufetaxokex.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210716132426_139450550.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/707961d33124d4b24d5b1f39a824c0bc/sedudax.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_off0000db05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 10860 bytes
SHA-256: 090f67ceb8492a6260115cbafab965b0cf9c78edc2e04c735026cd353b52ce9b
font_01_sfnt_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 17964 bytes
SHA-256: 8c3cdb6c01baafb441aa1ef3520a997867fed5d4b22083a58514d0e45b90ca2d

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