Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d35e64898c52ad4…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 10:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b55cda27d76d106b7898b64e8aee42d6 SHA-1: 7acf42b1128ffce11d0976a9ad320721f46487f6 SHA-256: 2d35e64898c52ad48440a4aac69432b758d7393460f7cddc547ae3680bd9122f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, some of which host other PDF files. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with phishing or scam tactics. While no scripts were directly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent, likely related to phishing or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://manilag.com/FileData/ckfinder/files/20210909_CB726834A240DE4E.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/44700533261.pdf
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/42557780802.pdf
    • http://tuvanthanhlapcongty.biz/upload/ck/files/14741205994.pdf
    • http://yachtandgulet.com/userfiles/file/78701418356.pdf
    • http://hotelbelleepoque.bg/userfiles/file/kowozakemobojisi.pdf
    • http://wlpp.net/images/blog/file/77400751887.pdf
    • http://lideparts.com/userfiles/file/1631461656.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427c7009cde---59739493616.pdf
    • http://fuyu.010bi.com/ckfinder/userfiles/files/10867715339.pdf
    • https://alpasol.e-giant.net/upload/files/guxizuruberovoxiri.pdf
    • https://grdr.org/paidel/ckfinder/userfiles/files/kavaraverunorule.pdf
    • https://sooryasales.com/uploads/file/65018569050.pdf
    • http://inruho.ru/ckfinder/userfiles/files/vexajofobofesiwazilajeli.pdf
    • http://tianlanip.com/filespath/files/20210901112333.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/93211543581.pdf
    • https://tttinox.com/upload/userfiles/files/40859131238.pdf
    • https://moiatakashta.com/userfiles/file/mimaretivaxezi.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/vn4gcusdrn4a0f3aujje7d80l0/86819413530.pdf
    • https://kapefashion.com/files/files/39350971477.pdf
    • https://hiperaktivite.info/userfiles/files/18644856652.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140773de2859---35855200717.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614123d7efaad---9479283762.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+remove+password+from+locked+phone
    • 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_off0000e3fa.bin
dc5649b68f8684387b493fa04d86690324f2e3080f7bf5b9d825460dba8d061d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 18604 bytes
font_01_sfnt_off000113ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113FF 16792 bytes
font_02_sfnt_off00012c16.bin
4d6cedc8e7b260ead71ac8367c7f2018110fdf85258624337174ea8bbe378642
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C16 11028 bytes