Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1fa09771ad21a9…

MALICIOUS

PDF

78.7 KB Created: 2021-09-19 14:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f780eb5d2a0dbdfae70c62001713f10b SHA-1: 5e5e29cac18067096363cb584ef2889bd6006d1f SHA-256: 2c1fa09771ad21a971db46e19eed6351ac4f1d7a726fdf962125cfa3cd0ef687
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=snyder+cut+full+movie+online PDF link annotation
    • http://www.medic-pneumolog.ro/fisiere/file/180144311.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/33966597121.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/12263613737.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/96034476649.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/65315295446.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff102299fe4c3fe569c40f6ebfd38a1d/wojowaleridux.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/19480839593.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c70aa49676795a18a6f99a251b2c1606/joluj.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/tavexavofizuf.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/xatoxelepetedadapokujo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/nn0b8bhl6j1fh4nd57mavp7hce/36426711333.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/wulitamap.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/83041579433.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161402c77ca8d9---tevawejovadufazupexamabip.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/guwofegumagerarawajova.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/ralaluwixij.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6e5i3h2ov6eka0och6t078srs9/dopoxovawodoxobagubapa.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614465cc9c69b---zegasusasupid.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b537bd11fa---7665057368.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/jeriworuk.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/binumonekomeze.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/10986839471.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/20449927665.pdfIn PDF document text
    • https://questyme.com/userfiles/file/11070102484.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_off0000d090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD090 10660 bytes
SHA-256: 1216041dfaffadf86817f859b9159f3cf3ec68b0871ef9879d0ff98f1d54078b
font_01_sfnt_off0000e903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 17024 bytes
SHA-256: f1f2075b44719369a3e3a53c10c5baf4ef15f0fcfbbfa4853a983211d68ffc3d
font_02_sfnt_off000114e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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