Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3b7067043bf237…

MALICIOUS

PDF

92.8 KB Created: 2021-09-20 02:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2c9a88eb284c4fecd70df380d12530b SHA-1: ad7dd5c01b0369702bf0274a0f968d4abbf833a0 SHA-256: bf3b7067043bf2372f9a798ea375d0fafb559e8fd81f69e4cc32834dadc8554c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://nomylo.ru/uplcv?utm_term=best+free+movie+apps+2020 PDF link annotation
    • https://mikludava.lt/images/files/tojuz.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/dubajogutowijuxomo.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/kemefenuja.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/poxebifajimimevinukujagek.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/lojefevuvuje.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/vatujesumororivo.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/1684860060.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/zutasax.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/kelizoxusaxujenape.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/mibajowobusidotetevimusik.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/jinarelisokepipeguwo.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/83269574661.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/mewarorezalutotab.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a7e414460bcd5433a41bcf96d48a386e/95296438841.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/vezimemawatijawom.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/lorabowativenibo.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/39591899724.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109032022446626.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392ce69e55e---biwejow.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/jetoxituxip.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/dixumesiw.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/25463917326.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/buvatosetiduxok.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/51174110787.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba3624e1a---tuxewudajatonilikopuva.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/q8ifsdge268ib6budicq0db54v/34651192352.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_off000107ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 10732 bytes
SHA-256: 663dcced77b5638ccc927b1acb21f4bb1f064cc5c5c123993ba709a6e7e2eff0
font_02_sfnt_off000138d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D7 17228 bytes
SHA-256: c86ad2d9061ba18e0435b1dc52b80a765a8bd986865835c244fae78a9755e5c6

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