Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa246010b4be646c…

MALICIOUS

PDF

72.4 KB Created: 2021-09-01 00:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e5793751d02190399eb3f867adaa2159 SHA-1: 7e7625e5db7e06fcc99ed61d2922cbe1b00c8070 SHA-256: aa246010b4be646cb7c21acc7208a3b7b598f3e9a485547c91a9fbd2145aa14f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/45374937751.pdf In PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/nenuoq8ca8mkv434jvn2ll4enb/91276801521.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c48e1421d9c---47558511716.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/47399286799.pdfIn PDF document text
    • https://ancoraeducacion.com/images/bukilazipuzeso.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/90a1657a4661cd9f46ec92992b0bfbf2/60694588976.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/675f428a81925e27991c76b3a761605f/64144581954.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ee3ac5427---pujetikamavadupogetarifik.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608407f30787d---66282473236.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/21726562566.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/lesenubo.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/90728611735.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/79086166359.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/jovupu.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/8038806629.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/buniwiketawux.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/gibasuwadezar.pdfIn PDF document text
    • https://signika.pl/Upload/file/fitutumigelufunef.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/39454416887.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a48f550c1b1---99278934429.pdfIn PDF document text
    • http://lucann.com/Upload/file/xalunuvonu.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/cm7mvvimc3hfcsjllgjna556us/87476374574.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/73873336393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=biodegradable+polymer+isPDF 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_off0000bac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC0 15968 bytes
SHA-256: f7d112d83651b5e62d43d72d9a703e40fc1e768c73641bfa31028a0757ad1530
font_01_sfnt_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 10840 bytes
SHA-256: db2bac0f1e7121906037633e2c116a34f3cb2bc2e663a22d1b7ca5b800f1db55
font_02_sfnt_off0000fc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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