Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d96265b3eb9168…

MALICIOUS

PDF

85.7 KB Created: 2021-09-08 01:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff73fd91e3e1a67591058bb2181f157d SHA-1: 5da16512802d487889da039c40221a894e026b66 SHA-256: f1d96265b3eb916869ae36295ddcb7406934be9b4ce5fae2ea3097244e9da92e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware or phish users. Heuristics indicate a high likelihood of malicious intent, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged the PDF as malicious. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/9mftioe6ragcv63akuu9f9780n/vonegesoxomogenarawagen.pdf In PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909f7456eaf---28330594875.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af961a6ed85---7540217298.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/jowasixofomujiwafupuzat.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad53a6ce8f4---67676419620.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865adcc9c21---83087852691.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3d9d938ae---65776637445.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/bosor.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/33317709933.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/22340972138.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7e40ccb75629fac76815094f0893a2f1/81495354093.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/furizagadagitexu.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094a35669d72---bokanel.pdfIn PDF document text
    • https://ebooksweb.net/files/file/49733152585.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a5cfbc0bc62f30ddc0a0440bbe084740/mibixuxis.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/sibavotusegalukewetemu.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/16030657021.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/43932950133.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/98526251385.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/658648cb5a0c27b1a76feadf2c476599/45400680585.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210713231216.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/tukilejezodosewokavex.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/171735247415.pdfIn PDF document text
    • http://polletnv.be/uploads/files/72013703702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=countable+and+uncountable+nouns+pdf+with+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_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 19320 bytes
SHA-256: e660efae6b40b5fcdc9e800b40a5556007e565a00ef2fa5436ffe5c62bb46078
font_01_sfnt_off000116cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE6 11076 bytes
SHA-256: a13a1e21853718228dc62baa809cdb6314a6f067b7d1b5013db3a39c7aa28d9c

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