Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f85e19f5ce3e39c…

MALICIOUS

PDF

79.5 KB Created: 2021-08-07 10:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64d3dab0876c335e9d0f64793bd0be8e SHA-1: bd23ac5146e9a77db593edf93a5e7a7fd5c8f199 SHA-256: 2f85e19f5ce3e39c85b9c8e0ae00ea0280b7e769d394b81fd34227696678575e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, suggesting it functions as a link farm to distribute phishing content or malware. The document body is unreadable, but the heuristic firings strongly indicate a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/b060fb9338fc4caabfc1a1bfe25a8653/88746692122.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eef6566ff9---69174214489.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/99320051573.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/12858940294.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/37542383860.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/pejepaxedasited.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dcf13a6390ac58bcf916f6ab8a660a62/gomegimi.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/4l82simmaqukugo2u46pmjde44/87939612885.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099c5ac055b2---nanotefov.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607074be4b994---kirusafelajeluxazof.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5c9088667ea0b907292214233e077b90/87561338767.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c25a73e72---wifonuw.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6f6251b187150fca001781e2fa9df289/86340830739.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160890ac76ad85---44752406050.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/gekolawedepepakom.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/siwamapixi.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/50967782579.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aa2125f72818d896014cd4d25083fd96/pumesavepoduni.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0410de036---sewuralusepitinud.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/pewum.pdfIn PDF document text
    • https://everestart.com/images/stories/file/vosul.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160716fe38141b---72739807981.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/kumijafanatuteni.pdfIn PDF document text
    • https://777mto.info/contents//files/72019507498.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/zivewimigebiwapikefito.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/komipamisoxilipajunetago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=amazing+spider-man+comic+espa%C3%B1ol+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_off0000cde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE4 11148 bytes
SHA-256: b81d9e6426d6bf49b7ebfb29a7a5da7c858b344d5d308ad794bf5e6e37721816
font_01_sfnt_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 18152 bytes
SHA-256: 623934047356f07eb02f040bc5f81ee525a0d6a1bb06608b0abab422ec40a385