Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63aa3059f2ff3c7…

MALICIOUS

PDF

89.8 KB Created: 2021-07-03 04:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: caadc1f5e038504b74b955d62d047afe SHA-1: d51e211e00a942c9eb1bd5fa9e4edff4fa870cea SHA-256: d63aa3059f2ff3c75e4894535072d89fb4d89f3b4c8e2773d23d5a7df2a46e3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://pistant.ru/uplcv?utm_term=cognitive+behavior+theory+pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/594122bb320f4586508961b5d1a61325/82367621670.pdf
    • http://bhk-aindling.com/userfiles/files/davezi.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/dgk8daksuh2h35tkektgehl6sd/rudemetefavonojoton.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ddab2ecee---917419815.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75de00cfde---gotifujum.pdf
    • http://ecogestval.com/userfiles/file/49571642295.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d14e88c242c2d3dbd066f20cd0eb1da4/vapabimegeze.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a99ea562ac1c1829dd6ecf0a820d1d2f/42810883616.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160934dd242a25---55904737425.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c209ab396---rixagijomesukinif.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/r320v6n6f7vfcckslifu88rj76/84626938743.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aebf6bf031f---zuronesobavopatopazu.pdf
    • http://flooroverstock.com/admin/userfiles/file/dujazapopazuwivo.pdf
    • http://mosjob.ru/images/file/wivezemasofeso.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160702ca56e46f---namepaxudepasonawoxo.pdf
    • http://alituncer.com/userfiles/file/fajol.pdf
    • https://efnnma.org/files/file/sudawubopepigudewapubi.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f0de5ea7f20145ae0ef619b40f00aea5/sovevitejegupe.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ccd308d8b---81332160670.pdf
    • http://go-pxl.com/uploads/files/39107496417.pdf
    • https://condicionamentofisico.com/arquivos/file/23115240544.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1512f3987---12345377294.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_off0000ffd3.bin
a48e2fc7a1e991daf645a78fc4fbe021b8bd1ca57a320c9521b07a91bba3a903
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 16012 bytes
font_01_sfnt_off00012917.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12917 16792 bytes
font_02_sfnt_off0001412e.bin
6c900dc61c8e6f324abb500ea8bcecc4608fc5f63f351f01028fe3e24c30b871
pdf-font-stream PDF embedded font (sfnt) at offset 0x1412E 10916 bytes