Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc4b51efbb39dda…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 04:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e2fb497948daf78bce1f848af6f42729 SHA-1: 396b118aa105cadfc2066ed31f69aea25f9c8061 SHA-256: 8bc4b51efbb39dda9641900fc208dc5657ef4c851a2ad4e58c533d9b1c1119f3
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains an embedded JavaScript stream and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • 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://piazzademarini3ge.com/userfiles/files/43127148465.pdf In PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aebbd88c8---95494779677.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/wetafilonajivetisokiz.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cec84186a4---43899237089.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/41107043211.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/bb9q16m9jko2se77qbcuu3fv77/numifubavumituloxawotizef.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/8841677452.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • https://smartcirclegroup.com/userfiles/file/rinijaf.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161410d8acf3d6---dotelabekusatogoves.pdfIn PDF document text
    • https://menu2uplus.com/images/file/gamuvulekolepedaporidap.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/9963767085.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/46739550725.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/70437063955.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432a27bc938---nipazajewufukobusutadalo.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1cb1cc9e585546a9e390ac7e68d375b8/zawobaviretamilebilogov.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210905051132.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xemolur.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/43088228217.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/fakexabosixib.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132377e38fda---sozobitudopabugojus.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/gadegokuluxinedikekexej.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/6cae2d8aaff67e35bdfc7144b72da8bc/13577594053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=hill+climb+racing+unlimited+coins+apkPDF 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_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 18912 bytes
SHA-256: 79412cd3c5d21d4cd0b366ba9bdc45896b9a91e8457ca3c515705af31d343919
font_01_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 11180 bytes
SHA-256: fd6b3dbf47006efdfea33975c4f4a2e4b3cb5e8962df623e905acee840b1cd6d
font_02_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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