Malicious PDF — malware analysis report

Static analysis result for SHA-256 a743ec2926df1afb…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 10:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 6274e1537a06e0b8dbfa230362455380 SHA-1: 833977eb715363dcd0e0bf48d3ca56334dfbb3ca SHA-256: a743ec2926df1afb432757517f705f9466ff3c4753634122cca850dfc27f40df
144 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources, many of which point to compromised CMS upload directories, suggesting a link farm designed to host malicious files. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to obtain a password to decrypt a payload, a common tactic to evade security scanning. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4f05c5faee2998fa08a9aabe8a277c28/likix.pdf In PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ac67b8e1---pivasiwojakuwud.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843945eacfc---41845604428.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/numuguwamup.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/59690174319.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775a160d11a---sedebimoxezarelapibo.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/fetap.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/92891508071.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/55112744681.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089edc4485e8---69292086004.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/28558630849.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210812210209.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6b14040657fcd5f2f414f04c913e9520/42089503982.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/69707003826.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606fda0eacf31---pemekaroja.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c407aaa1410---57011730351.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/41201736526.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/f99a7e6f4e2bacc0f377af2a8c9e13f3/xusafufedavukigedefosa.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/96437286842.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/68590954593.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/lozakebilivugopinuwevepiz.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/8rh5k0mckmg4jr62ivberpv94b/kepolijisuv.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5nu67f1oj6rq0kshroeitjpss7/24790412017.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/030ep15ntp429oq1753iuidjcs/gegedarisatinajel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=dodge+journey+2009+manual+pdfPDF 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_off0000dacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 11240 bytes
SHA-256: 59ae20615d6105e3e28faba3c7572f36230a0522f56dd62ba64db4dfb68b7ff6
font_01_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 17300 bytes
SHA-256: f51ed7d8a49714b2cb0841d1886a35c61f46d382f760f91d91be9bd1c01b78eb
font_02_sfnt_off000121e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1