Malicious PDF — malware analysis report

Static analysis result for SHA-256 61849e79d613e7c1…

MALICIOUS

PDF

87.5 KB Created: 2021-09-04 19:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 419ecdac798bb2f26b9236caf935dc52 SHA-1: a8f50e653eb05bcd92ba4a90211a3cb4d736fcad SHA-256: 61849e79d613e7c190ad89ba554ef27eb2405638e8c4ad2dc592206894884380
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of external URIs and link farm heuristics strongly suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://drafthe.ru/uplcv?utm_term=useful+spanish+phrases+for+conversation+pdf PDF link annotation
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/6df2a1c12ac8413ec13b7e12f27a061a/bimeka.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a78b3e0c4a2---57884217840.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/xulumamoge.pdfIn PDF document text
    • https://airshow-bg.com/file/rizaveguj.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210617183642_rc9zra.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b800a58a58d---39690638967.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/tibipimozapalim.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca05986f65---xuzozu.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/12400077166.pdfIn PDF document text
    • https://renewone.de/files/95716271692.pdfIn PDF document text
    • http://adveotec.com/img/file/mowoxak.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/pafosesozunulakezokerugak.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/gopomokirir.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210815080225.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/64531422813.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/3608109887.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/nizazesojezozetegozufal.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/36323540288.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/62897015419.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befbbedf4c4---patipuraranabejawejetomuf.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4fe3210d22114b9a982e78f7db6bd5d2/77507173597.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/pudekiwagebojonujin.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c5125d86717---gonagafutabixowosuzosijo.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/gonubitusixabagewi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f61e9c5da6---vizododiderowetevex.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/7731868281.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608816ade07a6---fowoxulubikaka.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_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 19416 bytes
SHA-256: d0052a47647806fd2cac7a20b7d7284b214417f2d11059247660f6a992210ddc
font_02_sfnt_off00013519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13519 10888 bytes
SHA-256: b9e8b0c4171da1f2aaa8c132b847f5593962f80d384d62c59812bf96f10e9690

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