Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ba9341a682883e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 21:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 102f23ecd751940bf88126ab41d208a7 SHA-1: 0250575adf500728d8bdbc6f53967f624d9afbf2 SHA-256: a5ba9341a682883ea16d318d2726959050d29e0241a201d4739d8bfd5da71b4d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be SEO manipulation or hosting malicious content, as evidenced by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://nandeestationery.com/userfiles/files/rifonivupekiwevofanoratit.pdf In PDF document text
    • https://ecoretras.com/file/50891245541.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/95272176732.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/5103223950.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4c2019cdde0529c5781e60f37cc8ff2e/diritefarolozorujuxilav.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c162d619---2838032699.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/vonozuxasukag.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/30340581415.pdfIn PDF document text
    • http://sy-smile.com/upload/files/14538033567.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701677ca357---jonozepis.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/bipelimis.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/r6kr1hiqe41644bpppfvsdfmql/vixuzuxeses.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/k333ji3li93aj95kl77shplto4/4536473394.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d23f91533e---79447784566.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/1274906489.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/46286732637.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/jabix.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7df86a114b3334bb4f289308221fca86/dozinalotaw.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae3862cf9---zilepufigidesoxujolazepiw.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/r204cnnvmdqnps4rdcd4l1jm5s/wokixemexigavi.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/75859354381.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/22031564716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=write+the+electronic+configuration+of+chromium+and+copperPDF 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_off0000ce44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE44 19412 bytes
SHA-256: b0c87a32347f571475058926ed7828e5bc74a662a5f2670797c21a9a7854c8c5
font_01_sfnt_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 10992 bytes
SHA-256: 017d23b89a9b8bf4db74dd6683a837b682abd5b00e8e4af9bb66f45168ae14de

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