Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b0b8448ab9998a…

MALICIOUS

PDF

84.0 KB Created: 2021-08-10 16:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b892341d7136413430ef9b5b712369b3 SHA-1: bff860e4bab6831aa1d1f5db2085e0b0eb2d34a0 SHA-256: 31b0b8448ab9998ad652f449b7fadea0266dc654632f6560cffc24505225e817
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608df98abf2f0---13280668759.pdf In PDF document text
    • http://imreelectric.sk/uploads/file/78756625671.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/sojepuf.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/47753061142.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/lemenaduwezejevugom.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/rotivixezivipo.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210806_054339.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/48289239746.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/filevigipepopomuto.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/4384b71f82b82ca5568aecd0f6c2d3ba/pexoneferaxu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fencmsqflc1jvtjgl8lniuvcb6/36989618483.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/30984612078.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/41483254372.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/sewasubapagifasodow.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/medotavapavixibi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e907c5ca44---31931985365.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/b56veo4nrq50ht2bh69o4tsk7k/xator.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/19fe58bad47a28897ca01fb270e05910/ledinejajiribezejepirim.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/98889736202.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/a6283c1e95ffb9ec12e0181bec41bad4/22048149760.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-30/20210730203327899585.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3331_20210724054311.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/titokekogowopiduwopux.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0c35d7cbdf149a66642619a36381a5f3/72086755832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=10.s%C4%B1n%C4%B1f+fizik+1.%C3%BCnite+konu+anlat%C4%B1m%C4%B1+pdf+indirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC989 16384 bytes
SHA-256: 6bc4420bbfa61156f096b6f0725168f8601d7500e332933a6f3144c23c09a2fe
font_01_sfnt_off0000dfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 11292 bytes
SHA-256: 27703ababe22be9761f1bbd7d66c1b81ae45761004ea2fb77f777f40f1909467
font_02_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 18072 bytes
SHA-256: 0ebd3cfdd5a58a2a84dfc619e1d9c24e6e7f052da7111ed049ffa09f400eff10
font_03_sfnt_off000125d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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