Malicious PDF — malware analysis report

Static analysis result for SHA-256 1955680c3fe6375b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 11:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa9a513fdd9585707a3ec986d205cc03 SHA-1: 26a28233fa31672993ca969019134d1f0206a256 SHA-256: 1955680c3fe6375bc480d7de2586b7440a815efe5a2cab84fdbd23c37f69025a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The ML classifier and ClamAV detection further support its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of external URIs and the lure pattern strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.flamanville-76.fr/upload/file/pudakunaxasupukasuzadun.pdf In PDF document text
    • https://luatsubienhoa.com/upload/ck/files/44875289931.pdfIn PDF document text
    • http://carbonelite.ru/file/21210575063.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/51086933034.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/gojozebusasa.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/67661910622.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140d4c77980c---32603702494.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/xotexixozogibodubaxaluter.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/fawato.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/kugumisilibibidujawo.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/82669919424.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/75704056107.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbbb885a22---nerubi.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/2202696421.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/janofovif.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/mojapufunewuvoganop.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/manevapelapaxazog.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d2dfcd62e2bf527b19cce655ec3cb287/36262618887.pdfIn PDF document text
    • http://knipia.com/userfiles/file/dijejuf.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2j07diho0fet936083vq1qs36v/13431292133.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/danobijekifivofewo.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210918170100.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/4k2s3btnq0i2qsfenh7i21cd38/3349336745.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/weberajij.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7c33d1dd584c8e892a3f39e73bf792d2/97470330108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mortal+kombat+hack+mod+apkPDF 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_off0000d514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 10508 bytes
SHA-256: ea4fd378a69d303d369818bfbf00682e041389f710f95dcd9a5027fdd31003ba
font_01_sfnt_off0000eccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 18124 bytes
SHA-256: c8b510ba454d2182dbcf4c454f694d3392ee3d581c9896497799745c51a92f86

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