Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6ddcd5850958ae…

MALICIOUS

PDF

80.5 KB Created: 2021-07-20 17:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1ac60e3cb9ea36bafda2c17d9e5bbae7 SHA-1: 0cebb5fc78c14c762518b136b7f435ebb5cd89bc SHA-256: 3c6ddcd5850958ae0d99362925fd935db8ff57b075b66d6eabad87dd86818b33
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and other potentially untrustworthy hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites through a link farm. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609a760321ef0---josozafegidamobupolo.pdf In PDF document text
    • https://northcoteplaza.com/userfiles/file/felewasaxipuxu.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/17371566257.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/41963790454.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/wasexawuvazijekezi.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ae1be2e5fafd6a10bfec48f3640d7b47/zezotowaravereluvavopi.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/41350413610.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/fn98js5tergug1n6gpcplcgijm/ninebamesexixelabijowuke.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f77cc565c---31951644056.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/um4vckvs3tcgo8v477dr4f699g/niputobesu.pdfIn PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/jolejenatixi.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/kuparegapufu.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/t5bf48e7i5npc8gpdh5a7ok9b3/gidog.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/puwovavonavapavozamirom.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/venasu.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/woneb.pdfIn PDF document text
    • https://chp-travel.ir/data/file/43350850310.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa383db45c---gamogogalekerefewatoj.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/32269033502.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/50a4b9b4c8ca7174a4dafa1b72712553/24080304977.pdfIn PDF document text
    • http://ezibra.pl/upload//file/dejepudulovog.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16074217e1b2c6---vesanepiwuxugaligumalux.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/74490169556.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/guzupunezukinux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=prophetstown+state+park+trailsPDF 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_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 17156 bytes
SHA-256: 62b9c506063ecdf31b931c626eb99df08af9c60743d27703cbe6915f2e4a974c
font_01_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 10528 bytes
SHA-256: 4f782c590950ed616ebd52c27d5032afc1572f279531eece3e6ae0147ec7e524
font_02_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1