Malicious PDF — malware analysis report

Static analysis result for SHA-256 963f26a564c501be…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 01:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce237d4055643c2af28d3ffea653bff3 SHA-1: 6a214c011c6048a9701db70acac9d86ce4ac33e8 SHA-256: 963f26a564c501be098f746d2db445e5c829196b20e26191e80369eb4fec02c9
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to facilitate further malware downloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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 http://profitoolinfo.ru/ckfinder/userfiles/files/19884500918.pdf
    • https://tinhhoaxanh.vn/userfiles/file/dugobokuvolimefeti.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ovl4plsih6n99aek8en0gss2n2/ligomowewi.pdf
    • http://kursadowicz.pl/Upload/file/saletodoxigekuvera.pdf
    • http://theflowermaker.com/uploads/File/kexutabarusinajuwotaluko.pdf
    • https://g4m3s-4p1-12s1.com/contents/files/levuw.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/bifuzidokopezegu.pdf
    • https://simplehome.ro/ckfinder/userfiles/files/40960473374.pdf
    • https://topclassgreenery.nl/images/file/50435403815.pdf
    • http://gyogytornasz.hu/editor_up/86966811329.pdf
    • https://jackinthegym.com/uploads/files/202109021004296632.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e803ba51e---bejeragoguduwufaredu.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133560027618---pavarelaku.pdf
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23602934187.pdf
    • http://prinsart.ro/uploads/files/befanikeganewib.pdf
    • http://ciskmv.com/css/file/nediwuvixanazav.pdf
    • http://sportingfoundation.com/uploads/file/gagotavafunuboxotik.pdf
    • http://clean-ecology.com/Upload/files/xerabowavo.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613519d8a5d4c---zixefozaza.pdf
    • https://candica.pl/ckfinder/userfiles/files/kilapelukigomunaxotil.pdf
    • http://fajni3333.fun4two.pl/uploads/assets/file/jarutifexibapemis.pdf
    • http://studioriboldi.eu/userfiles/files/65531929175.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tessa+and+hardin+full+movie+download
    • 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_off0000d489.bin
269d88a6dee4c85fd710de5269cac444cfdc082f872a4e79e5c79f5e036c6faf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 10736 bytes
font_01_sfnt_off0000ed01.bin
a28b69f6daa97ebadcc962edf89b76576d99de9b992b45ea6abddc001567d885
pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 17140 bytes
font_02_sfnt_off00011959.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11959 16792 bytes