Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b50a12dbf01ea9…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 00:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7b38898a21676079a808a766cd716c36 SHA-1: 97440d2154395e866ec023f4e147fe358e8e23e6 SHA-256: 61b50a12dbf01ea93c45cdf970e385e2f36e837cc9e799b70ae327e792e9038f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of numerous embedded URLs and the nature of the heuristics strongly suggest a phishing or SEO-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613efb8edf59d---dawewubofaselepaku.pdf In PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/75801956228.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/74307983921.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/57597653104.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd326b7504---37968535428.pdfIn PDF document text
    • https://protum.se/file/31305327752.pdfIn PDF document text
    • http://dasbluemchen.com/64774766207.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/xizogatu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/78429335927.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32540622077.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/vflor8268jvpmkdoo1hsiolj2e/gabojilepanonisiwukuzu.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/44392002558.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/39652016765.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/sevevutepinelawirizafure.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/17598710531.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/7144595956.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465e2dddca3---38042735379.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/99598493505.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/90941969765.pdfIn PDF document text
    • http://millecolori.it/images/file/nawomebig.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/51360466441.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/lilirez.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/nizanarofa.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/raginoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=awesome+tanks+2+on+cool+math+gamesPDF 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_off0000bf1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1F 10764 bytes
SHA-256: 974917b59370471a94b6895417dbb2b1548e4f543de7681080a718dcb9407d14
font_01_sfnt_off0000d7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EB 16780 bytes
SHA-256: 707509dfe1ce77b2c3332384dd3cddadcc2a503189af65bd7ca76ba3b88217f3
font_02_sfnt_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1