Malicious PDF — malware analysis report

Static analysis result for SHA-256 381811622cba3a7a…

MALICIOUS

PDF

101.3 KB Created: 2021-06-28 18:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f28954a24039b58c46b974d0667da4e3 SHA-1: cf88e9eaee7d3857545aea9554135c75ec80b988 SHA-256: 381811622cba3a7ae0ffc9c7eb1175fe7a9053f717936765e92d36ec6f700f07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URLs point to a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://mfcwestenkwartier.nl/beta/userfiles/file/xolave.pdf In PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/dilasativatigibigoti.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/jagiraxosawerezoxif.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6ea262b2---lapofuwasogevanosel.pdfIn PDF document text
    • https://inifd.london/uploads/file/viturano.pdfIn PDF document text
    • https://tckontrola.hr/files/65451373153.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6792818102---pifakote.pdfIn PDF document text
    • http://www.asslar.de/downloads/jibutekezabekuwugapa.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/fesebadowap.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac28d92dcd5---34621320334.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/peuhmccc3fl57jeh6lknpi0m88/rapumakepalixopimo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c925263c2cb---dikukawulanipigete.pdfIn PDF document text
    • https://strechybenesov.cz/content/77102088348.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a9bbb445b09fa9e3f9272a526e6c3e0e/47198247904.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a753010b621168ec31f068183118a0dd/4663270060.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607369adc1634---9235180161.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6f8361f56---loredorupewewovasaretes.pdfIn PDF document text
    • https://dm288.com/slicice/file/68248069772.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e4a5bed5---gogaxiloviwezubar.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/nivka6d6s2lt2qcgp7v1f1vv84/murutapuvekijiwe.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091a7f1ed79e---ralaturanirisevuxazon.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f9e64a6814406099d4b037582d3f52b1/5954178365.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/xasojamatukotofafidi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe09d67188---89369892844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=camp+counselor+interview+answersPDF 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_off0001294e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294E 10820 bytes
SHA-256: 792137ce7b8ab3ffa548476d2ed6c407c35531b924953a7f5cb0542ed712af7e
font_01_sfnt_off0001424b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424B 17484 bytes
SHA-256: f9f6e72850c4bb45c6ffb316942fcd7a3c47f854c8a5000b345a4c82d2cafe6b
font_02_sfnt_off00016fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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