Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bcf6ac304c9555…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 19:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93ccb2423fe2f71b3e80593bd8f25d61 SHA-1: 018adccc1e171e9aa5c9475d959e0cbd654f7525 SHA-256: 82bcf6ac304c95551750bc21d8d3cf363ebd7afc31abf885ec42c6d3a35de077
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of multiple links pointing to external PDF files hosted on various domains, some of which appear to be compromised WordPress sites, suggests a link farm designed to obscure the ultimate destination and potentially distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/585bd9eb689980e330b1ded88f6bef84/kugenenat.pdf In PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160720acdcde22---zilizelikujafifupuwulitu.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/6771423200.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/nividijenado.pdfIn PDF document text
    • http://sswjeans.com/files/95701771432.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/55f22a11a17ebebb1c69a8378444977c/neremovewiterebawixutula.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/1df968d2a7425cdfada5baa907265067/98200963816.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/fab345061e3b5eb4de346c411a56a7d9/petaxezuze.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210621194621115.pdfIn PDF document text
    • https://avela.md/userfiles/file/vadekim.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e56bad2c6---lubirakidimule.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/c1d66e23e3505eddf0f78719fb674ce3/xigudadideduvumewanopiw.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/68133957240.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/99492575191.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/jojubafon.pdfIn PDF document text
    • http://join-angel.com/ckfinder/userfiles/files/39833262685.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/oqg8bq4504ndhhfv4sgpjs29t5/pasepul.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/doliwajuzid.pdfIn PDF document text
    • http://mientrungpetrohotel.com/users/files/bomiruvamolotulasewag.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a121a1327106e263e19e6968db8f352b/zuwudetarixugajotinisa.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/g3gccotbgh8fi6dbbcbhjv7q2j/10094551574.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gogumitesateduwan.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/81980397571.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610124659d687---ravejemeni.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/38455784004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=nutribullet+veggie+bullet+manualPDF 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_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 18720 bytes
SHA-256: 370e166a5e1c5f0f903e1e6c2220de84a22fe89e1e3d9d71654d48cad65a6560
font_01_sfnt_off0001113f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12956 10444 bytes
SHA-256: 88e553dd6c035e8123d84cadd3e9091fcdb84cf4d8fa807e9fc4975ddafa7168

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