Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1aacce66480e67…

MALICIOUS

PDF

78.0 KB Created: 2021-09-14 03:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 317705c9843669da9f29f7b8f631f18c SHA-1: 4e04c028e361b84734b3061e7533ddc283309e0a SHA-256: 2d1aacce66480e6795e9122f6eafdc43c984dbd1a06619e703979bbb29598eab
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a large number of embedded links, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://techielingo.com/fck_uploads/files/11365023114.pdf In PDF document text
    • http://sostrevalli.it/userfiles/files/51176145744.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/98538013486.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/99541812011.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/98775174926.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/70741073127.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/nuvopidilela.pdfIn PDF document text
    • http://pinxedien.net/upload/files/99143738424.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/82408387420.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/28e244cb6a21bbdce56c0eadea9ca893/5292997136.pdfIn PDF document text
    • http://neteyes.eu/editor_up/sumuvunox.pdfIn PDF document text
    • http://zeci.nl/im/image/sujajewuwozifulikele.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/difufavaniv.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dolozepup.pdfIn PDF document text
    • http://pi-consulting.ch/download/20312870612.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/tigat.pdfIn PDF document text
    • http://espicycooking.com/files/file///41494906343.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/219ed6fa597ac6bae695208b86bc4175/xamizewitelabo.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/42703044796.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/degedosemixaz.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/63110346467.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cd0e4621e---difefabasaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=free+app+to+transfer+files+from+android+to+pcPDF 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_off0000ccb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB1 17284 bytes
SHA-256: df57a0c6559dfc96f8b833d3da2c2afb14c1602d3a07f2e687e2252578ad3ba5
font_01_sfnt_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 10756 bytes
SHA-256: 15618b4064508d490157264a4139eb105a0c46641f2499230a060bd6e5e33310
font_02_sfnt_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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