Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbe5b4b1e68c928…

MALICIOUS

PDF

94.6 KB Created: 2021-09-07 05:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 69586c926d97a412ff36dd8f3007f9e2 SHA-1: f15289d7a94976c137020d686440cb646fd557dc SHA-256: 9cbe5b4b1e68c928e8bc753d838bcbcb72df6fa64af8e1a77ae9dae968d2c735
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://33podarka.ru/pictures/files/36541957270.pdf In PDF document text
    • http://cuatro-pr.org/sites/default/files/file/49656843118.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/4edd692d8a3cd9eb602e89cebfe6b983/zusizuxifajidi.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9rf8ibcj916lhd1l58gj0tuan0/3872677349.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3k976idaoj48ruhh1obuh12r91/dojag.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/394b71c26377f80d6f8bfc8f0cc29401/44924595927.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608223c7a0cfb---92053746115.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ab21fbc0560b5bcc78c90c284234aeb4/giravoguwuz.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/zomeludixipini.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/lidimunolupebegujewej.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/nufileduzefuxapafosul.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/91eudu84qlsv0vahuovk9safu6/genusuveza.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/71050339298.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/dezilusabe.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32af43eeb8---kebiwibapijoba.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2206bb9e3c---dosakozenoli.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/22660374995.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210822060438_1228668684.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/55d07517d224844ae1f78fa10951cf2b/59528617783.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/xozewonapilusofafuvido.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/dd80b283faf7b7ae74889ddafa9632bb/27217838398.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/34611891483.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/8771619291.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/18800582851.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bab9d605bd---gasatolamoxijeto.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/luwawagomovaxivisidoberoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=english+textbook+10th+grade+pdfPDF link annotation
    • 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_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 19120 bytes
SHA-256: 3b592b6a7220d25caf4785b69c21c243c8e8cbdf15fe5d7ad99762193e7debf2
font_01_sfnt_off00013a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15261 11268 bytes
SHA-256: 626bf37af68a3f71bc07bd79c291a2dc9e0774f1bcfc5edf8ffc89d50116f760