Malicious PDF — malware analysis report

Static analysis result for SHA-256 f764d60c968f7a40…

MALICIOUS

PDF

86.0 KB Created: 2021-09-14 12:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f480e59ce3cab908bc5620240bc8f3be SHA-1: 173b83a9edbfa14eec41197d8d79cefb4f1788b3 SHA-256: f764d60c968f7a400935686d2adbaaf5dbae0c01a451398399a460fe41981552
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, and is flagged as a payment redirection lure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to trick users into clicking links that lead to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://midoriku.zaitakunet.jp/app/webroot/upload_images/files/wimuli.pdf In PDF document text
    • http://regmac.net/userfiles/files/zofev.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210907200331.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/5477115169.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/88135672460.pdfIn PDF document text
    • http://firegallery.ru/img/upload/80813349203.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/64147850795.pdfIn PDF document text
    • https://suruburi.net/mm/file/lijupeb.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/zaponetovisaboxunaka.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/e8fb5464d0d540ca7f0b78d060ef279f/gomevuf.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/xamiberevufekajaf.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/18140153920.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401eb2009de---51540994503.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/44738344686.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f24f84b282---tiwufidarini.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/71429391717.pdfIn PDF document text
    • https://braus.uz/images/shared/file/91169459773.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/18141692261.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/67121399722.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/24936660709.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/6758239572.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/zunubikijesukep.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/17184258655.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/vivuwuxumotabit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fortnite+dev+account+generatorPDF 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_off0000e6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E5 10472 bytes
SHA-256: 8bf29b593333b63b2f1c7ebabff193ec5707685479052cf48ea50c891d7601fd
font_01_sfnt_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AC 20048 bytes
SHA-256: e213389aa4b33d05a56ddd293f440bf23f03063c7afe77e4f02748ebe9da3b1b

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