Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5964742cf87930…

MALICIOUS

PDF

87.3 KB Created: 2021-09-17 00:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4a24a80b94bbbbed47c15c4c019a2dc7 SHA-1: 7d46b5a35cc4c1d3795ab276fdd52167bcabe949 SHA-256: 7e5964742cf87930ef7c032801396c289e75db3a5239e77b7a451b4e004e6321
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://karate-talence.com/newsite/userfiles/files/46492469627.pdf In PDF document text
    • http://pharmorgsyn.com/upload/files/badosajuzaravoli.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/91953912303.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/54726928865.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/vawifisoji.pdfIn PDF document text
    • http://consade.com/userfiles/file/14158087199.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/23827456609.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132f2533e642---17799929379.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/49985238225.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/34784871392.pdfIn PDF document text
    • https://ms01bet.net/contents/files/68533121338.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361f2252636---fivawi.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba1528889b---77124454632.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/19730945191.pdfIn PDF document text
    • http://birdwatching.sk/media/file/48553355897.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/60264526377.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/telesudosori.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/muwebe.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210908050359_346273580.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/setizude.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/86518085349.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140f2421376a---toxirale.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/48al5ft0i1rmeha3b3vo8phpq7/99366395253.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/66587302156.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/limusuxesomu.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/xetikapojibapofanuraxivov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+most+expensive+app+for+androidPDF 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_off0000f1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 17180 bytes
SHA-256: cc3c47e2b0811b6895313e77a63847a33b6fe5f21ae36bd5882f17e921c0c4e7
font_01_sfnt_off00011e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001361e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361E 10848 bytes
SHA-256: c92aee651a4dbc5c562b75fd8596288cbb97e4cdb2c90d2476a6751ec9179f9b

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