Malicious PDF — malware analysis report

Static analysis result for SHA-256 709f6807f3022464…

MALICIOUS

PDF

87.5 KB Created: 2021-09-09 15:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 88896d890a197928abf625607f64f1da SHA-1: 086c01afb87781f4913cd61e8ff8003af703a96a SHA-256: 709f6807f30224646fde63fdc4437a030f02c82ff958b8b558df710fe8b7ed27
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external sites, many of which are hosted on disposable domains or compromised CMS uploads, indicative of a link farm used for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document instructs users to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/23634323245.pdf In PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91388684813.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/14151003951.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/57729132018.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/bupeviludazi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139206e62596---lukorurururaselidutat.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/41093624549.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/83153976853.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/lufisutenuwawizosefevema.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/mezon.pdfIn PDF document text
    • http://temple.mo/userfiles/file/rewimibupadunivuba.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613476950cbcb---44319342642.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/22414673681.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/subowomokisuk.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/80773453630.pdfIn PDF document text
    • http://sparkpro.lv/content/file/notarulugavololiwibatis.pdfIn PDF document text
    • https://medius.sk/userfiles/file/29687563429.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/40292197141.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/xubabasotetokijulo.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/25707883618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=como+descobrir+a+senha+do+wifi+no+celular+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_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 20088 bytes
SHA-256: 1aad6773bb53e0d27a4e2d8c42dcc3f5f11695f89c3f5a980847676d24bd110f
font_01_sfnt_off00011eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 11000 bytes
SHA-256: f200030f062b2c701c5fe5fe1948af75e84fd098831a9e6710e7fffb2b8d04e6
font_02_sfnt_off0001381b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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