Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c18b5fc74bf37a9…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 04:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 255fd5932ec33532599092c287790812 SHA-1: 0d1b61b2fde4d22601383f8badb0f233c3853a5d SHA-256: 4c18b5fc74bf37a9261fc93260dcce7c84e3040aded29f05ea53c381e43f82ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://syntellect.ru/Repository/file/73941886.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c88309aa0b5---watukunabojemukaximimales.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/79f187e14facefe2b6dd376eec9c3434/96781309692.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/22800238141.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc32ee0eee3---95929627015.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c8fa2180a009e993516ac4a9b5f8c468/32367818614.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/49055493266.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/9s74ed6t0hdt2sicv53uhvhbr0/39311652105.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/1qe4bjqvqqjnlhbbs5lsum25g1/piwosibitagiwewi.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/kulenolofotukajuwo.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e84ae8f905---mupomisajifozotejen.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/pofizesozegixosaj.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7cdbdfd4efccc9e1c99520396324b09f/98740778940.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/nh7jd35040eijg98v778omrui4/tonoturatibiduve.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9t1nmqvnmls41njn8i9867iaj5/65621248056.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aaad594d2b4---53314178830.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/fujokisolipivubapalodizo.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/dumosifuzufuromom.pdfIn PDF document text
    • https://sealskinz.ru/files/file/68694457320.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc9096df42---81653903260.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/41223428989.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7d856fd696b0987259d0d64774614365/41967750739.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/b9a4c4687e7f55752f45417a7f3de447/23409246107.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160af97fc310d0---3754983311.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf110261b---15255915818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=network+sniffer+raspberry+piPDF 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_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 17580 bytes
SHA-256: ca974514d6b064dc9c1b170c2415d0c69f5633eda40afc222159be6fa0d7aabc
font_01_sfnt_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 10712 bytes
SHA-256: 9aec4759f6fc28142d47ef51ef07ed2c53e8e2b5b53aa5d8b0a11865915ca6c2
font_02_sfnt_off000132ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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