Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bffe44e2941a2cd…

MALICIOUS

PDF

87.2 KB Created: 2021-07-14 04:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ab0f338d27174d55387ee0e1502c6a6a SHA-1: cc4f9f9c0613cd0b83774d68fd1d7c88adeac971 SHA-256: 1bffe44e2941a2cd2e9bafa9d58ab4e87d4c58378b82100e244dff925482a64c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other potentially malicious sites. The presence of embedded URLs and the nature of the heuristics suggest it is designed to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6c8cf645780f3d00d0fee9fb4edc6ea6/guxoririlabizajavefibuv.pdf In PDF document text
    • http://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/vunawewokizam.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ed71ba228366f52a7c4737b8e2c3a9b0/83092259985.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608146403d8a8---birivogexegopus.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c6bc522e---rutuloxaj.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082fbb08b4bb---90339327566.pdfIn PDF document text
    • https://2acontractor.it/images/file/wemigofumaruwobuxedes.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/14212831415.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160771d7c9cd85---rudufek.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80556121529.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160794ea36eb03---62281884387.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/84141747815.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/61f50faf5d4233545deb807b73845bad/lukuvobu.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/92597904813.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/584fbc3a373f218b00dd1ee854e75bfb/nipuvuminafetaguguvakemis.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/41208d4b814ae795f32164da2b294e58/xovibaxefapevuvox.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/37595224626.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/gujesovilenupidu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e264e9daf3---17530951761.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/sewapogejelujadijaj.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b72e6ebdc5---nurapivinuxedabove.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/neguda.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad9fd41e45---xunotefizot.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/pofivipulanot.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/51991580770.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/debd1d591841b69de7cc85585706b0d7/65440373089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=in+order+to+extend+the+civil+rights+of+slavesPDF 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_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 10872 bytes
SHA-256: 871d8fddcd12b0f5d3f8b976b8665e3ec983aa420d29cfdf8673f17714bd021d
font_01_sfnt_off00010d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12571 16192 bytes
SHA-256: ebec28a66e609a378a85af8daed0c7c618c2dcef57b8271d2afa8fbee86f1ce9

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