Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c96ac8aca6ba9d…

MALICIOUS

PDF

96.4 KB Created: 2021-08-04 06:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 624a80922d95e1526954f875a5bcac2b SHA-1: 11aa035d553c12153df3e2c422cf98ebd35aed24 SHA-256: 85c96ac8aca6ba9d4e4d158e737885e8d2b99ff3c16197a41767691211906492
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple domains, some of which appear to be compromised CMS uploads or disposable hosting. The primary goal is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lab4050.com/upload/editor/file/rijimukos.pdf
    • https://ebooksweb.net/files/file/kerejipivumolikufazezuv.pdf
    • https://gsm.company/ckfinder/userfiles/files/27824642398.pdf
    • http://amoy-art.com/Upload/file/17947293505.pdf
    • http://bomtvplus.com/data/board/file/20210520041905.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/oubardg7dp6p8spddvsqholn0g/tuzofijinuxode.pdf
    • https://seerupit.dk/assens/file/6905606439.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a678f64cf5ba840598f2ed270bf2f08b/tojono.pdf
    • https://houstoncoinshow.org/FCKeditor/file/kiduvufojani.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0360e34f7---12516470903.pdf
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/37374307846.pdf
    • https://premiersuli.hu/files/files/siwafise.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f18a547f8d723538afb518cd78f5fcc1/40807902538.pdf
    • https://menu2uplus.com/images/file/88415744951.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbaefd6e55---tarof.pdf
    • https://doktor-ara.com/userfiles/files/72353401170.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/8a3e5e422928f8ce41be0102aec7ef3b/lupapiju.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e31dc896d2.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8cb741b8c4f9f4b6e82e59786ff5d668/vabibezunawe.pdf
    • https://centrorevisionimonregalese.it/file/ximuxoraneretosekuferig.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/64e46f5c34fbb1bf02b7dc244d728cde/75859146128.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pafeegmhjqkpp5b2pcjrce3al1/jenejotizuzutifip.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/20705472531.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=which+one+is+the+best+english+grammar+book
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 16792 bytes
font_01_sfnt_off00012acf.bin
0a71f53bde428161f09fb6e467610473c7b3a496bb1692d472777e503d6f370b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACF 10904 bytes
font_02_sfnt_off000143e1.bin
b691f700232b33947d9620b55836dd7d6c64ee1e2e78ed918f6dcbdc309e0ab0
pdf-font-stream PDF embedded font (sfnt) at offset 0x143E1 17564 bytes