Malicious PDF — malware analysis report

Static analysis result for SHA-256 24063e8e650a630b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 10:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc8fd6c0a0f6dffd4b39082195c319b2 SHA-1: 885d92f1384b3cc0cdde4c8867e6fd5c2a1f67c5 SHA-256: 24063e8e650a630be899a6e2af2d955e473ba3253cc2463cf98e19dcee2d105f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The presence of a 'download button' heuristic further supports this, indicating a lure for users to download a payload. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://wagnerpc.com/userfiles/files/wokeligusivetunefupi.pdf In PDF document text
    • https://santaclara.com/wysiwygfiles/file/9582829512.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/98147204620.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/53725181.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/mifuximoxurikawijiwik.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/13235398532.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/posamasopupijilukutisux.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/labokizuvinagudasutukuko.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/turukur.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/pajetodivudojukuvanun.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/xufowigidulabi.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/jimuvozurinukezilanobodew.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b4f43b9ef---lozumaberimotewowejiw.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613335d74c61a---78248382682.pdfIn PDF document text
    • http://chinahongji.com/d/files/bunuf.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/14297925094.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/45585160513.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/xuzanuj.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130335238af7---dogujoma.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/guzovamokakunefolinave.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/29665237906.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/45069229334.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/11743415710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=after+we+collided+full+movie+downloadPDF 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_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 17692 bytes
SHA-256: 7b00ec7719027ea2163f17f09e6def004e372b5ba5cd4725be0b505a925d9fe2
font_01_sfnt_off00010eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12706 10704 bytes
SHA-256: 27209b8ce89b573be3efad7ad2eca290f3f9deeb2aaabe8b90a227afd4bd29cd

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