Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edae6dac4f31eab…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 08:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c9499864e001693965df69d5675f3d4 SHA-1: 1658e7f25689ddc7327439a3939ed3fcc9687abd SHA-256: 3edae6dac4f31eab7a9ddbdbb5ff2e8ba515cb3ccefeb93577d2dbc67f0642ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to download malicious software. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users seeking software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://lnv-cnc.com/userfiles/file/jemab.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/76625398566.pdf
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/41921867360.pdf
    • http://come2menorca.com/images/file/wodadugamelodumedosupoda.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/03a29654b570bdaa4e3c320e7644d40c/zawoxugufegaro.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1612f869b529c7---83755157394.pdf
    • http://kirakuramen.com/uploads/files/66706014335.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614e42353bac1---88867783412.pdf
    • https://vanphongphamhienluong.com/upload/files/60225905297.pdf
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/38709864306.pdf
    • https://hotelharmika.com/assets/userfiles/files/44409069987.pdf
    • http://zulassung4you.de/bilder/file/50004427673.pdf
    • http://edu-family72.ru/content/images/uploads/file/begimewawuru.pdf
    • http://bettaletroom.com/file_media/file_image/file/17785225404.pdf
    • http://divapharma.com/uploaded/file/40563224681.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161472d8d1c790---wepovima.pdf
    • http://hmed.vn/upload/files/1276223311.pdf
    • http://svaz-podnikani.cz/files/file/65041437922.pdf
    • http://comlark.ru/userfiles/files/46207150251.pdf
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/26300542237.pdf
    • http://nprofit.hk/userfiles/zotawisuwu.pdf
    • http://dermatologomiguelgallego.com/miguel/fck/file/sogikofizatevokoriza.pdf
    • https://rasathantrananotech.com/ckfinder/userfiles/files/jabifunoxu.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16145835c5d454---90205489929.pdf
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/kesememuxipirivofebivaxu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=adb+software+download+for+windows+10
    • 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_off0000b598.bin
344683e110750a33f2fceff957f536ac55a3f09affb645c462cb2cd04e3776c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB598 10728 bytes
font_01_sfnt_off0000ce77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE77 16792 bytes
font_02_sfnt_off0000e689.bin
a4c49207d96445915c9810d74ce6937da6473f203a155f0a566bd503f1a1ad82
pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 16396 bytes