Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcf6b398548c3b5…

MALICIOUS

PDF

77.2 KB Created: 2021-09-21 00:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2d866fced373accbd10c2759280e43a SHA-1: ade6b8d33d36f06ba329b88e86b82710662bf092 SHA-256: efcf6b398548c3b59277d46c75dd9193f87d384439ee0d3a48c6fb742178c6e5
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites, suggesting an attempt to deliver a payload or redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://archism.ru/uplcv?utm_term=ssh+tunnel+android+no+root PDF link annotation
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/veseti.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/tezariwoji.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/69788047932.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/26322375821.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/notobusifujid.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16147f8753863d---24681307663.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/jaxekewu.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d9dd6893---memikuvewolutevoxopuwuwuw.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109081451031103.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/93307004832.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091215503773499.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/82127683652.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/43917529793.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/duxuvibawepezelovalobuvu.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/60870746018.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/69571106021.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/tisekatakivagisavum.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/43055573592.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/52924203315.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/pamutujojew.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210906_141224.pdfIn PDF document text
    • https://grancom.by/upload/docs/86832395778.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/denogetegazu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614274045bc79---57236370796.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/rumizosamezizew.pdfIn PDF document text
    • http://short-story.ru/upload/file/dikewadeniranejekemurolu.pdfIn PDF document text
    • http://plncse.hu/php_data/file/43220126383.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/rufabet.pdfIn PDF document text
    • 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_off0000c79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 18132 bytes
SHA-256: 7358a635ff404f424b6b814a330f3244605ec07da6eebebde6ce79e75d3bc42a
font_02_sfnt_off00010f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 10520 bytes
SHA-256: d3e2e88866f256153feb094dc420bb4bd4b6e45c44b887cd50d73566fd40c619

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