Malicious PDF — malware analysis report

Static analysis result for SHA-256 67fddb963d560171…

MALICIOUS

PDF

82.5 KB Created: 2021-08-23 18:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 01ff4d7e9fd1f4d7cd3290197293b5bf SHA-1: a23936fba2826bbcdc7aa556b2fd5d77f0f22f47 SHA-256: 67fddb963d560171726b487fa66488402a5eee78213a029edc52df09e6493bb5
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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 https://coretry.ru/uplcv?utm_term=federal+jobs+by+state PDF link annotation
    • https://bacninhonline.com/webroot/img/files/xomepifapikubokowiwojo.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccceda3842---35604581110.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12145dbf1---dukorisatunevenolalasew.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/42928482128.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/ebef4f06cd21f4362c8e8b0da06f87c6/tezoguvusalosew.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/eb83a08885742aaf918a4a96ee2e3fef/92403451417.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/680645165.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/0146a9b7649c6d66583c3bf0a937a90c/jixaluk.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088cb8094f16---43397828246.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160840981bd43d---birolimudibezotilebuda.pdfIn PDF document text
    • http://mesterek.net/tmp/nitox.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d244215dde32bd00cea76625789d1b69/bufojelaw.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/jupifimiwipeles.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/96241451187.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/cc27fcc396bc4da8b857d3c565bfca7e/wonixiboxovajiwonanedubo.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/xutimulixubukijikibelepa.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/75859749228.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021061401364259033.pdfIn PDF document text
    • http://mp-journal.com/media/file/11292486837.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/urdku41craeie7rq133hl6unk6/94768102761.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/75929969262.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/lefosibaxevinojigekido.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/3363908463.pdfIn PDF document text
    • http://webursitet.org/Files/file/64359090676.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/pelavoduwojawofuza.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0b64d45cd---56753098449.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_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 10408 bytes
SHA-256: 2348d2edaf581e4c5acdd4d9815cf5df842fc9295a2900ac95255345a2f34029
font_01_sfnt_off0000f6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 16636 bytes
SHA-256: 68499ded1fe31f94851b6a0b15a506d52d22a286673ed2d22db03ca8917c527d
font_02_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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