Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81464e40a605993…

MALICIOUS

PDF

68.5 KB Created: 2021-09-07 21:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e55275701b480adc8927e2da0842f610 SHA-1: bf726d82732b786fe6f9c441a5a3e6b90f074183 SHA-256: b81464e40a605993ec9d52a33528b9fe3f37ae8969c33502695b338de0a2ebcd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links, a common tactic to redirect users to malicious sites. Multiple heuristics indicate it's part of a link farm hosted on compromised or disposable domains, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://bastola.org/userfiles/file/xalulawazizumixisajo.pdf In PDF document text
    • http://sdds.be/userfiles/file/83161598174.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/walivogibaponijemep.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/63754945165.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/3bf78a232ff8705902188ceaf1c1d90f/dugudevaboxot.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875e6318356---47312141384.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/2844634223.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/widomed.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/13799576440.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/79067087742.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/galekiwawopifozabirafukex.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/06/18/81289427517.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/40067239955.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/40281206641.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/73da2866c50066adb6ba6560818bb7a4/62637173741.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/gs39bovml7nndq7sbecvrvb1v8/69264346044.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/vatukagaf.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/43249890801.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b31675aa3f---8188350667.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc7016056f---85604286319.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e18ec69341---wumaxinidolozu.pdfIn PDF document text
    • https://ksa-machinery.com/images/file/gigamaga.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092659c705fd---gividutawujuluvapiwinoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=raymond+annual+report+2018-19+pdfPDF 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_off0000aea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA7 13592 bytes
SHA-256: 020ed23cc6075ffef38f288108d33c06910920c622e020de3e97340c7aa6ee4b
font_01_sfnt_off0000cfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 11364 bytes
SHA-256: db8ebf62703c4c8428466db43d23cf075aea098a526206d0d73e472c0c6a9371

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