Malicious PDF — malware analysis report

Static analysis result for SHA-256 c838836e9b10616a…

MALICIOUS

PDF

87.0 KB Created: 2021-09-06 14:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6e4d2fc75d059536ffc596f240dc4c22 SHA-1: 53a2e23e64dc9c0e808a46579f4b66f77977fa51 SHA-256: c838836e9b10616aea5e7d0e07da8a42ac99ecd4280e746f65d166c6626c8883
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an effort to obscure the true malicious destination. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=toronto+ttc+subway+map+pdf PDF link annotation
    • https://playindiano1.in/ckfinder/userfiles/files/88600452988.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/gilewenetuwef.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/42qscnh4gvk4pudepeou29hl0h/dekomaseri.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/504754c7b0c8fd5d15a26516b5e8dd2f/ribosadenepudubegugodav.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210820030511_882923594.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/51496892655.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/98611907956.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/77011832851.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/vatowameresado.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/l7ra18dtbqeirj450d55k0f1a7/65115452970.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e26563840bd---18090259614.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/jisogav.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/vodalebegi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5b5b817ee4---zodufikonizeg.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa96f0c5abbc9e9da861f02d650cc3c7/wezafevajex.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5013d353a8---botidolawot.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a9994aa0b---29232804600.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/niroxanamisofikopuvu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/029f356a3e7f4dff554d745a2cec0167/votabuw.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3b66a6ed98f244dbe33792d97b518e2a/lasowiguvufasuferapate.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/9be1294f856c0b5016885636b4bac125/pebozaj.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/51308875307.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/leduralufinaweji.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000eba0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEBA0 18032 bytes
SHA-256: baf19339afd05f09ea8e6fc46bef73b646577f4b03be5f3649095d7b13e9e697
font_00_sfnt_off0000d38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 10916 bytes
SHA-256: 40a463b522718c6b15d4c68a16e935cf19fd91db445e8d30d70f679b7f3904df
font_03_sfnt_off000120f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F2 17224 bytes
SHA-256: f89e1007f04061f0d565f9355318f82b0f48c6c15b12d1e64f8ffb8a7813348d

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