Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b4da86b0952e72…

MALICIOUS

PDF

83.3 KB Created: 2021-07-03 11:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6081228376d90a11224bf00e31de0b9a SHA-1: 4c80a48583d97c3e787f17e460ff83add79e62a1 SHA-256: b3b4da86b0952e721b5d591fb57a37696015326ce3a3f7e161584a709741bdf6
164 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://drafthe.ru/uplcv?utm_term=funny+jeopardy+questions+and+answers
    • https://ctapigroup3.com/contents//files/32747409542.pdf
    • http://abw10thstreetne.com/uploads/files/38827506226.pdf
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/mmpo9qidl5r0tcuue6mtc3ka6i/5031620849.pdf
    • http://orchid-daikanyama.com/userfiles/file/38263900808.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4250f3f7fc---zuzop.pdf
    • http://mynigaoe.com/upload/file/20210511190915.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/chv5dgvoa1cndacmn8sv3rrn8m/sawunikuvafejejiduwoset.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/20301788368.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092c3710f81f---palopodosed.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608518bf0a134---97281820367.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/019d76663d51cf9c81d759072ee96fbe/gowapalefezapexeroxovut.pdf
    • http://casier-a-bouteilles.fr/file/lojidutuzixu.pdf
    • https://pasarant0g3l-turbo-h1t.com/contents//files/55564902735.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/7u56cun9ig152j7ljq2mvph3il/91406857462.pdf
    • http://se-ty.ru/uploads/userfiles/file/79259178225.pdf
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/wodatoz.pdf
    • http://alice-immo.com/userfiles/file/19882167998.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606f66b966d0f---luzusazozo.pdf
    • https://kristinanamaste.eu/files/72036540904.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608041e6c9fda---76733564216.pdf
    • http://munnarinfo.in/userfiles/file/xejexibufo.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/c7tl41decdgrst0i0f1i7plavk/rurowamit.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26ac2aef52---33203703325.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/m4vpptdsk9fvsdosdrr50nmho3/begefu.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59edd556c5---16524645848.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_off0000ded9.bin
bc09db93ad2b6a8bb3945450273e4ec3726d3df720a08c8f548405601e347697
pdf-font-stream PDF embedded font (sfnt) at offset 0xDED9 10892 bytes
font_01_sfnt_off0000f7fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 16792 bytes
font_02_sfnt_off0001100e.bin
1ade3f02ed15d92fbda9a750a6ec31e9c39205baaedadeb0a4096d8ca20da777
pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 17744 bytes