Malicious PDF — malware analysis report

Static analysis result for SHA-256 5370378a983125c4…

MALICIOUS

PDF

73.8 KB Created: 2021-09-16 04:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 67af4b632292a15a376bb5dbb9cbabdd SHA-1: c5cd99e852d56311872ce18930818dd9f24c4319 SHA-256: 5370378a983125c48751b5225ad3cb4e4bd2315c61b58fa2eab7f7496829b391
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://dekobonner.de/userfiles/file/30673080276.pdf In PDF document text
    • http://saluteebenesseresas.it/userfiles/files/20679778537.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c09d4debdd25fa7ba24c56222d91b5df/nejebowogumajepofa.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090408170755.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/65183125184.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/85691006862.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/70877776430.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/xotokugekopomomorafe.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/visasomivunafobi.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/vodudawabopebiwulezisokil.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/8477505337.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/dadikevojalalafugodimol.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3648250bc---tajujova.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/pelefabazutaparunomarujuz.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/77614785289.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/vovom.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/34672740866.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/85fc0bbhlqfdgruuh5com1tg37/juvenarabotuwuje.pdfIn PDF document text
    • https://ekransamara.ru/files/jeturidewuna.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/zaperixuw.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210913000456.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/92286639566.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/luvozawuwasafofamelami.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210916071732297115c4xp1t7i8z89.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dil+bechara+watch+online+moviesPDF link annotation
    • https://easyown.ddproperty.com/datas/files/najinivofuvibufo.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_off0000be70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE70 10788 bytes
SHA-256: 6ec7f4dad08c683fb07cfe850cc5bcdb35a957b01d42a1ef169f6e3d1274b925
font_01_sfnt_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 16472 bytes
SHA-256: a93e9d8a28b2e9f58d6c5ef52ed07d279275be24436a4fe272affa9ed5d3a945

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