Malicious PDF — malware analysis report

Static analysis result for SHA-256 259f586900ddefd4…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 02:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de0bb163b722bd4cf163fba68e109288 SHA-1: 179c633d34aae8d1a2bcffccc22d2685ee6ab415 SHA-256: 259f586900ddefd4fca4625d4a116e09482ea972a84be6fb1ac98d227bf68bd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

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 http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959668e4805---sefetininijur.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c6902b028---48832817312.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/67218705601.pdf
    • https://llibreriaha.com/img/events/file/1540534563.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129442819846---96479058186.pdf
    • https://asken.as/bilder/file/58541183432.pdf
    • https://sanipro.ma/app/webroot/uploaderfiles/mobapuj.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd0a4cb2c0---82714744042.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfce75dec7---nomaxe.pdf
    • http://www.mediagrand.hu//data/editorfile/91636811130.pdf
    • https://gastrotest.co/ckfinder/userfiles/files/motoxefedutelowisevora.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/ef589b3a894b4dd5df3b6513dbc9fb45/vepidodokune.pdf
    • http://sanarina.de/ckfinder/userfiles/files/37860519792.pdf
    • http://kopdesign.nl/userfiles/file/zezodobejanozawamulimukar.pdf
    • https://marblobathware.ph/app/webroot/img/files/fipatimodav.pdf
    • http://hrzservices.com/uploadfiles/file/masaxa.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/3612bead4956bef607c13335e372dcac/23210032821.pdf
    • http://ypdtools.com/ckfinder/images_store/files/73785023087.pdf
    • http://hocikto.info/userfiles/file/4815561174.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a714c74fc---fitavenoj.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/1f9d01e1abda0def9890dc587166fa76/xijoferokipekopof.pdf
    • http://cf2sc.cn/userfiles/file/fexasezemegeledexekimobaz.pdf
    • http://cnokorea.com/userfiles/file/jonakebe.pdf
    • http://gadkowski.pl/repository/filemanager/file/33920615165.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=anal%C3%B3gico+y+digital+otl+aicher+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_off0000d2a9.bin
981653d23dd3abad5feabf2b9c735639f9bb3e01e4edcd81054c9d6acdb2e37c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 10964 bytes
font_01_sfnt_off0000eb9a.bin
69d6c02b0b4fc1132e10a65f19fb38b55cff02d5aa65e9a86a8bd35640fc199f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 19136 bytes
font_02_sfnt_off00011be6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE6 16792 bytes