Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e769ca5a50053ea…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 22:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41a528009631c063e605a894600524c3 SHA-1: 2b4b06c409bdb7e01c6505b442a647007042d8b9 SHA-256: 8e769ca5a50053ea6325526f1963be1100f3e7004923889331ee0e3b3a933602
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://propertiesforrent.com/userfiles/file///29842238698.pdf In PDF document text
    • http://handsonmontessoripk.com/userfiles/files/ripinulofitobi.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///14272375335.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbd15d8386---ronumama.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/loseromoxatebix.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/7427768420.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c6905660ef217a289dacb57754cfbcd9/zezudawotudoba.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/komilunolomazofunuv.pdfIn PDF document text
    • https://okazionche.com/files/9193328925.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/37580349023.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/83196268755.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134f5162f33d---jafuviwuwebazesomo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364ea8ddac7---20712664482.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210905075151.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/feparuvapuritemur.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/39564027007.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/11524647756.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/zujediwaruxiwevisejodo.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/nefobu.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/xevefozujule.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/34297682752.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/1781e905b5f92e3d70a8a36a878d1e1e/71038185902.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6d693856b---67115343001.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/85825866683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+ultimate+fighter+season+29+episode+1+free+onlinePDF 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_off0000dfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBD 19128 bytes
SHA-256: 64b25219bb8aed14b285b1de8a6b03866e66055ccc9e70d236f0bc6e86bb62b8
font_01_sfnt_off0001112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 11348 bytes
SHA-256: db860eda21ea4f61cd6de71d7be3448e5f76c47dc4b5e20d120b8b11338017e1
font_02_sfnt_off00012b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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