Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50f2514dba53ffd…

MALICIOUS

PDF

115.3 KB Created: 2021-08-14 18:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0edeb9d1eef06eb562907d27e1730f03 SHA-1: bee37a65849a5844987d7c63cb2b4eaeace7bfcd SHA-256: f50f2514dba53ffda12a91c5af718d12d8b2be664e2f3d63383c124b85040aeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to lead users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

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://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813e7780671---suzebag.pdf In PDF document text
    • http://volamtuyetthe.com/userfiles/file/wupokitegalavadakurazuf.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/renadipefesovapivosez.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f83456fc5---dedon.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/900e8b84a7e1cb54823770cab23520f8/13138115677.pdfIn PDF document text
    • http://klhl.com/userfiles/file/40411373330.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/73a362eff87262d8b834abfde10889c8/batukijewezibasol.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09a0464041---takutomatudexupif.pdfIn PDF document text
    • https://zzhqhi.com/d/files/xupelaru.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/57ca9b856355672c3da3c06f7ab6bb93/8175536284.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/27162039878.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210605_2C5C86ECA1930ED4.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/sd98kj87r2hbv0dpsukffgjtn0/vozefijasulela.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a22128926---70739362738.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c92737c873c782009e2d3b40940c1a78/4042397724.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dbd76981---rivopitase.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbadf1ca62---26530805551.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/84506494200.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/gomaluxa.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/28825b0ab847eb7ada096c53274ef993/bogodofolikisexa.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/xewufegixukopodamo.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb6beca03a---suxitujabapekomelokanatez.pdfIn PDF document text
    • https://digicpictures.com/downloads/44497019621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+abstract+wallpapers+on+wallpaper+enginePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB1 10828 bytes
SHA-256: 06a01d83760209037eaf5b683a9a8bed9fd5a2f422eb582d91146466ba655769
font_01_sfnt_off000155af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155AF 21888 bytes
SHA-256: adc05c5c85f54e0fd1903ff6181d8d6d884fc7c3165ca7fac22894d9df73f664
font_02_sfnt_off00018f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F5B 16352 bytes
SHA-256: 470e290952ef951ede6d6c7d5ca63c035db2632a033eb4bcd74a8159b858b555
font_03_sfnt_off0001a565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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