Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fc6acb4eb416a6…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 07:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0bede33de2ae73e3e8bcb3aabc015c19 SHA-1: fa0ccaa4f0252b3469c4c09595503d5103446464 SHA-256: 93fc6acb4eb416a63270ddbcf7f5cb525a94f120ae2fa808a5bfa0fd8396cde6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://laborke.ru/uplcv?utm_term=smart+tube+next+apk+for+android+tv PDF link annotation
    • http://skinct.com/upload_file/file/Fl202109021645147951.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/domit.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8dcce535f---857449945.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af7e3bf3f---detiripababuwesinaruk.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/67714585752.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/35538150314.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/3357595676.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/zakepezuvatinekan.pdfIn PDF document text
    • http://metallpress.info/files/88630883102.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/65942983994.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/nolabusikejiti.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144038678aa9---87742522757.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/80348763890.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/jefojosipiruduxef.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78823da6f---12566571742.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/49644473241.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9c54822bc65c0cc98689bac52af30ec6/99213050537.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/44337466811.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/rewipibalowebojoketepola.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef7722efc4---sogabopin.pdfIn PDF document text
    • http://machulski.com/public/file/nimorisusepase.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/45986ecdb6d2808102335fd3f4ee8a2d/43605918525.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ba408e28---lavagemoforipudajunaparu.pdfIn PDF document text
    • http://nscenter.cn/upload/files/82299735544.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/somususeduwofipirasuvibob.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b740988b05---sewumemesukomuruv.pdfIn PDF document text
    • 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_off0000c7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F5 11020 bytes
SHA-256: 9237146fb7b70683d44e9a91650a381eaefafc7161af663034281a692a83a872
font_01_sfnt_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 16308 bytes
SHA-256: 0b3fb8bd87d3f37256c7857bfc3b4e9281d38514f2c19ae8d13877c08539be73

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