Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9037799d17bf7ac…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 03:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 624a2ad68907f2b2627444ba8d8c4f0d SHA-1: 3a935457c8943d0ef09d811567f8bcb642e7e460 SHA-256: a9037799d17bf7ac0179ed2136c83afe56fc39460ae2f3de7ee4069edf0b20b7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious. The heuristics indicate it is a link farm and a social engineering attack (ClickFix) that instructs the user to execute a command, likely to download and run a second-stage payload. The embedded URLs and link farm structure suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://iuoooo.com/filespath/files/20210904170949.pdf In PDF document text
    • http://mrpennarak.com/user_file/file/42041491627.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/69525437561.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352a6a28bfd---wovikijotijapizuxawekazep.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/gidebivalosolunaxilaribe.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/65724526349.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/bosumixotip.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/vifoxejimaluferemifin.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/zaremafolovakidemoxodivov.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/16612874754.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/zevimekimoxulutiwolosudax.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/tivivamovadiminiz.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/77210559807.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/79618659152.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/kopexepevidigemojuwa.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139c4c9f3eb0---nisuvopulezexoxirox.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/98389233450.pdfIn PDF document text
    • https://euchebnici.com/img/file/moxozalose.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f934e58161---56501693973.pdfIn PDF document text
    • https://ghnservizi.com/file/41104848525.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/nozimesixanexuporajatopi.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/sadoxidarubiwumojabevevuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+sims+dlc+downloadPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/bavoxafedewiwedaranora.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_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 19772 bytes
SHA-256: 8d9093ad585ae46188c97165785a8c48db96a66a4a3e6abeae4a63e30aeff6ef
font_02_sfnt_off0001263c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263C 10484 bytes
SHA-256: 24154aba6ec12ab5ae7563a5472526e2bb4015002a25b9a37e52a14aba014d5e

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