Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc889771e2aa160a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-21 10:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3a468f1f81a83c14754158706606c364 SHA-1: 7c17265ee2617d52185acbd0405380f47f1043e4 SHA-256: bc889771e2aa160a1f1a4e30fe4d7d89db6b2bd85a919ef49507ea80583dd8e9
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=dark+mode+on+chromebook PDF link annotation
    • https://dermatologie-chamonix.com/userfiles/file/37705587565.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/11722545901.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161471747771ca---8748615074.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/88360320219.pdfIn PDF document text
    • http://askort.pl/Upload/file/bejumakefisu.pdfIn PDF document text
    • http://bollnas.boj.se/uploads/userfiles/files/tudosulirulenudutegamukok.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/31444399055.pdfIn PDF document text
    • https://mavibusiness.it/file/78112299019.pdfIn PDF document text
    • http://snft.ro/media/file/44294370509.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/sowozojoma.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/34fba38f8552b936972c06edb0ff8066/74410561802.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f64219ie2ak8c2g0f6j2q78g44/lekoxuvapozotugerulisedob.pdfIn PDF document text
    • http://masonhn.com/d/files/2442870845.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/nonanurafabekivarapit.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/tisurijiriziximapiwebu.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/31726803307.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210919163124.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/xemejopixidu.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/42092765411.pdfIn PDF document text
    • http://normel.org/files/upload/file/95104092597.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/povokubosovexopafagifuwo.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/kujamegevadedusalise.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/29581625834.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b2c2a3f1b99a64d1f4acee8682eec644/5391048929.pdfIn PDF document text
    • 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_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 17776 bytes
SHA-256: 9805598edcf7f1b90f957145d06ec8b87353cb681ec80d63d3aeb13067653f40
font_01_sfnt_off00011833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001304a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304A 10464 bytes
SHA-256: b8e3db1701fc506aac5c4639d9a02b5d40a1f9b46103dce02548c1827b774d12