Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4e8d22acc0bd31…

MALICIOUS

PDF

102.8 KB Created: 2021-08-13 06:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a30d15c25b5c58ba93a6fabad5c612e4 SHA-1: e5548500681afc2850864c089eeaff7e55edbcad SHA-256: 3f4e8d22acc0bd311348bc1b0524107724dbed1ca9392e1d225f007cf7d98d07
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external resources. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://chp-travel.ir/data/file/17110567088.pdf In PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608357cb8a257---65304902768.pdfIn PDF document text
    • http://wawa757.com/uploads/files/kunekiwaxozufidogaxub.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fbc1bc26c---puvogugokixavokeluzejuni.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/4grsgb2bslm58e82eo2ufn58t6/48702998074.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/nobumumigelasesa.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/gazovabelujugobovomab.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c9edcc4704bc777eb56d366884476b84/bozopifodapapegudepasefa.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/0b80e60def5b642d07a105fe54fbbbb2/tuzasekevofatukizavi.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/fubugisi.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fb81bb041ca4f5968e5bc39b244b6555/mogokor.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1aaa9384a---fupofita.pdfIn PDF document text
    • http://paliukenas.lt/i/File/migenaputuxaruwusotofoj.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/jiwukarakowuxedaramef.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/48590425476.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/7165736e104f24ddfa36541c678bd76c/71133986847.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfc304eacf---94596177388.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/50674710780.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/nutizijukomakavexeborigi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ecd03670---ligid.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5ffccf0b9879365d8db4734ccebfd12f/90695452916.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6cee3a0bb---rixuteraxadudifeb.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976eb30da2f---dafivofutunovusobe.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60a875ef6---69908204243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pantone+formula+guide+onlinePDF 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_off000126ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AC 21220 bytes
SHA-256: 2be8aa28b94470b1a1ecdf951126507f25b1e8dc7ef71b04fa31158a900570a2
font_01_sfnt_off00015cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000174d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174D1 10632 bytes
SHA-256: e6fa1957136b0685d2e31fc223c12dd4dd1fa8223970a7d3ec235fd4e445a8a8

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