Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93fe7c8ba5bf92f…

MALICIOUS

PDF

106.3 KB Created: 2021-07-02 22:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ac846f1241bc9e2fc52582ec506c4231 SHA-1: a6be20cd31783eb941c8233a49324d5bc70e6abc SHA-256: c93fe7c8ba5bf92fc5c96ca7758288929b2bdc7312bcbf858e0041c3749772e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://dimensioninteractive.com/WYSIWYGImage/file/naxirit.pdf In PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982af68040e---29246509725.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c03d46ca2f1a75dd37c94b48e8a4cbe8/30613049542.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/76323058209.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/74293676290.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/90654740733.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad370f0576---regaxaxukinuto.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ohe3vf30d2tsga2ctd3opn6723/makadixuzuzilibofizebonub.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/56093609751.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/67827390921.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/43511830674.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/mefowuzu.pdfIn PDF document text
    • http://temple.mo/userfiles/file/17606067735.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b33be5b0---zibirozigomi.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/kiwimegizowuzojuzugedow.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/qglcv5boi81u6mhop9djsfken3/85684494928.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d72c457fa482bb3ffc58021f954822f2/93327085819.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/xefiwilosug.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb718b260---23381769559.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/63937951344.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0730286072bbb3f52ee31476be42bb8f/nutalodizada.pdfIn PDF document text
    • http://abnicum.ru/files/file/bizamuwokubo.pdfIn PDF document text
    • https://dm288.rs/slicice/file/44145905798.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca482d15a9b---pavareju.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/zefawatuxedorimodedotudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=truth+table+for+nand+gate+with+2+inputsPDF 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_off00013dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000155f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F0 11184 bytes
SHA-256: ed7fe9053971e0f196eda389cec5398c3b7f68b5b1078d43e5affe0317386c0e
font_02_sfnt_off00016fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FBB 16836 bytes
SHA-256: 6ea04c0d9629f91286c3d6960bf505deb62ac28f6cc482c5c36d0590845d0b0e