Malicious PDF — malware analysis report

Static analysis result for SHA-256 1856afb5c33c47f0…

MALICIOUS

PDF

83.5 KB Created: 2021-07-22 00:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d285eebb13904bf711715d28097c6c4c SHA-1: 41959902e789fce421417f11288bd7c3b308ef7a SHA-256: 1856afb5c33c47f096c3ec729d24e2c435693c6ddbca6bbb4c291be548cccd99
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 domains that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kurskodkb.ru/page_edit/_samples/userfiles/files/sevorisozotakogezipifadu.pdf In PDF document text
    • https://namhunglogistic.vn/site/files/95812256218.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/65794047963.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/91522104174.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c887d8e3363---sajurifabukexuramaxaxikov.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/72844846898.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/52721486062.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/95038287445.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/16e3faa0915aef30729f286a86efecd2/wipegaxuzonufevovarav.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/47659ca55af719683e4c3fb04396bfe5/3154695747.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/xiwujafili.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/70522610924.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/68678221645.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/46320807031.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc2dd05a74---83205367559.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/kabenirifisamuvuxune.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/30359334374.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/rasekogoxosanuzikadake.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/f9ac2de42d7d1fb67feeea89a7c7bf9f/nipetodamakupe.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/nifonota.pdfIn PDF document text
    • http://charivne.info/images/file/zerugidid.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xosikulixopemifap.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96784632c8---kukezawotipuruzivunazezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=factor+in+math+definitionPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0a912158dea24f9e00e325d54846d9c4/51620631147.pdfIn PDF document text
    • 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_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 10504 bytes
SHA-256: da74c36f4ddd63488846eb27e5b582e9751985f21d32b201acb23c4e20308b19
font_01_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 17184 bytes
SHA-256: 8dbab4a5cc2c4b165a9a4aec111486282b1f8d08da71626e25103fd0bf678975
font_02_sfnt_off00012671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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