Malicious PDF — malware analysis report

Static analysis result for SHA-256 907e045aa349570e…

MALICIOUS

PDF

81.5 KB Created: 2021-07-03 21:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2729d3392f3955cb4d30baa6eb6c88dd SHA-1: 0baceaa7f437cc0060a36c7304ca8d68d3288c49 SHA-256: 907e045aa349570ed1f4af05306bc791ff75805ed27af5a4127c03806003f830
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of URLs, many of which point to compromised WordPress sites. These URLs form a link farm, suggesting the PDF's primary purpose is to redirect users to malicious content, likely for phishing or to download further malware. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16098be63a79ae---25970451042.pdf In PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39fa98f7e---pivikomorufepul.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/2uj4se8ks6fivd5c73o8qpa6t5/saronupoxomesavajasup.pdfIn PDF document text
    • http://screen.by/images/file/25332063637.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5e166b276---vekaj.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vesanonezimeboxu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/46lp20re4qu1urvopnph43cvp5/sisideji.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/sowogisuruzir.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901b377bb20---nuvupegoxok.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/nijubosorozikipor.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/m249kkhviakovi72eatfe80qb2/47491051888.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f4e7e33e---daxanas.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa97b951884---79253461697.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4532fb7fa2041d7b2be90fe5e422fb8e/45699416099.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/12696023753.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/dbf5a32d2bb985b031131eeba83c36ae/gozikapekijarevenaw.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/dazafuduravinukoguf.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/34iqm4j8gp67fk6na2i7rmul3c/14040716499.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1726e906640bc4f04b55ce9bb4075bc5/dafebumerad.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/e7278caca057500451c64acd532d077d/fegaxojawojuzel.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/9du9uheo9tnujmbekckevifr3c/goxagigi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbdc197b6f---27434746213.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3f969061794b9f1721f70e18c0ab42d7/zafedinipivunefewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=we+were+too+young+to+know+we+had+everythingPDF 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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 10764 bytes
SHA-256: 07fd6f385f11d7a297f55861f185cdeac983f3d107f1d578fa7f6703420635b4
font_01_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 17896 bytes
SHA-256: f43372a1d354400cf770e584ddf3ff7cd9166836d90d7c6088711d5cf548cc17
font_02_sfnt_off0001203e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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