Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d85cbee3eaf9dca…

MALICIOUS

PDF

85.1 KB Created: 2021-08-16 08:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a28b533206688f328f49dbf242c5df35 SHA-1: 140f39c0f848a59aa7f464f18c7ce2d04e7e8434 SHA-256: 7d85cbee3eaf9dca0a202dc4281fa6f427b32d5bddd2b13c8af6bbec575d0071
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm that points to multiple URLs, many hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608155c982216---35225028122.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160744d1553128---86097733110.pdfIn PDF document text
    • https://hgb.se/filer/file/tejukuvowirezolamemap.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/53651105990.pdfIn PDF document text
    • http://www.toptehnik.si/images/karamitanodugilok.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/5681773877.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2d0g7qirc2epsjst6qmaqsq5o6/73505214298.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/55043164855.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/57499927526.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cc2d2608a---76071319821.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/59515097714.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c710fb3ad1a0f349efd844c67001c0bd/matonugumobazuliwi.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077b5528e260---21107280665.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/foxunabozajefi.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/tovun.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/11cb69e88e29a8c949cf8a3dda974ef4/67892827410.pdfIn PDF document text
    • https://sambelteri.com/contents//files/21894288886.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/43489377984.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/20951202391.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/jusiv.pdfIn PDF document text
    • http://hainfelderteich.at/gakowalamonimi.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160e26e7e6975d---nulokaxegu.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1ffd784c36ab807b3a9706b8000744ec/gimobafama.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/fofabosilefubobizaveveti.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/32529045058.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/mqibdt15la4br3svm8bct2vi8n/48148438896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=kubota+manual+seeding+machine+sr-k610+pricePDF 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_off0000e7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EB 11660 bytes
SHA-256: 2a7e3ee631eb4b4af62e1fde640270d3407b70c0e7ebf1ee868b7c154b2d4f02
font_01_sfnt_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B31 16644 bytes
SHA-256: f6a321e7ed098871ad8be313aa7342f863f71276dff430b9b9b3731ab817e1de

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