Malicious PDF — malware analysis report

Static analysis result for SHA-256 f608f2b7aaa8c0f0…

MALICIOUS

PDF

83.9 KB Created: 2021-10-04 16:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 11001f5c7fc9585cc4852d9418b178bc SHA-1: 10a4374c83b7b96c17a93b025fdb83d2e9663b28 SHA-256: f608f2b7aaa8c0f0f88f9ab980b08b227290c2497a68b112500c652de4bea5c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of these links and the overall structure strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143785448c4d---42886820817.pdf In PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/75bbe7648b752be41d4d4af494116674/87446314951.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449ec53caf6---xizagixokemuvikolopak.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615325841835a---14256335981.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/rozesedevelofaralota.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u7uc7u328047f9n5eob89a4fu6/61302364602.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/ronejomobojubaxezofi.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/89633511921.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/26917740333.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaf5c7b574---72899199061.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210920_0DF7643154E9A7E5.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/poketimelapitod.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/jimisadi.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/famerevabibagusapalemaz.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/67734056070.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/46574880942.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/61880305051.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/2575942152.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/keretajemum.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0358b8ec---gerapobom.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/b6c378c02c218974f587d6048b61d7f3/99140499660.pdfIn PDF document text
    • http://origo.ws/userfiles/file/joduweguk.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/xoxex.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/40517296785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+find+sp+hybridizationPDF 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_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 10808 bytes
SHA-256: 3afb0e7081f5310e6c975feb59e5c5bedbf6fb9c0d456abe07b416a7b08fd654
font_01_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E66 19572 bytes
SHA-256: 870e2d94e2fd32b27fc82605441070a43b024b7e5efca9560327dcfd25cac243

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