Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05ca0dd09e5df56…

MALICIOUS

PDF

93.5 KB Created: 2021-09-19 09:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8218a584f13d966c9907836d2f62a999 SHA-1: b8afefaae75880286c5fc8781bacbbdb0bf662cd SHA-256: a05ca0dd09e5df56337c91707db098b7b118a7abda7c6c7784ecfc08eee6574d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various domains, some of which are associated with compromised CMS uploads. The lure appears to be a 'minecraft download' which is a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://smidgel.ru/uplcv?utm_term=minecraft+download+pc+pocket+edition
    • http://changrung.com/ckfinder/userfiles/files/xewuwozonipepaxokasagepa.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f104ed5fff---sanuzoxuguvuza.pdf
    • http://jvcc.cn/ckfinder/userfiles/files/210907060216502227hlhnx.pdf
    • http://tw-tms.com/uploadpic/xw/files/dumimagadejotox.pdf
    • http://ylpcl.com/ckfinder/userfiles/files/62751810491.pdf
    • https://eco-translation.ca/upload/editor/file/4287606905.pdf
    • http://gesundezellen.com/neu/userfiles/file/54751319614.pdf
    • http://agppi99.pretty-match.com/upload/files/gubipep.pdf
    • http://ros-audit.com/i/up/file/56603859003.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161305c9bafb3f---9530885575.pdf
    • http://hhoasis.org/app/webroot/img/fck/file/29667953097.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/16e6de5a5d7540561d48d3fe59d9a150/fodero.pdf
    • http://boki.hu/editor_up/87296186744.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142981f33352---durabipufipon.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lumil.pdf
    • https://malabarmail.com/ckfinder/userfiles/files/rirovi.pdf
    • http://gesundezellen.com/neu/userfiles/file/35948143982.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbf3a60db2---baxurojivavovotegolu.pdf
    • https://bocion.com/ckfinder/userfiles/files/30684522516.pdf
    • https://indicaperu.com/userfiles/file/kapoxunopusoxafirikew.pdf
    • http://kehlux.lu/userfiles/files/1782761434.pdf
    • https://cooperspick.com/files/70854953977.pdf
    • http://zge-led.com/luodan/images/userfiles/file/zisumuxebadawav.pdf
    • 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_off00010651.bin
1aa142161345949172595ccacb002fd1df782f79e81705f1245fd2e7697c59e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 18812 bytes
font_01_sfnt_off000137a3.bin
83b5e940c0dd518578eb8b0f6f6ee1b3e7b37a37aa9769fdd0a28be13c125e0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x137A3 10616 bytes
font_02_sfnt_off00015012.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15012 16792 bytes