Malicious PDF — malware analysis report

Static analysis result for SHA-256 62813240bcd48c4b…

MALICIOUS

PDF

102.2 KB Created: 2021-09-02 15:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85fddcab5bc3d19304b131d845e04837 SHA-1: 74bf7f19b2348fda0c3dd4bdff8ed2c31a38e3e7 SHA-256: 62813240bcd48c4be3697da0335737409d3ac55d698d40a91f5771596e093f34
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://oniceh.ru/uplcv?utm_term=air+duct+friction+loss+chart+pdf PDF link annotation
    • http://kantoromega.pl/userfiles/file/11458690452.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/dutosukolerivexorogat.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/7eqitkfbr0ko6856ifvtc08344/vagesiso.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/balagudokafiwe.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608010a5cf7cf---58882942718.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a15fdc1cb6---kisazorodoxulagitasidu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6b20df6f5---ramewutexawugaxuf.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/9230628235.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6b6dad18---nafiladalugemalazoxul.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/58080894322.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/wuxuxawamegiso.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/87258490171.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc68edbe14---zomezot.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/24483034722.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c729b981431---dadazelagunafenove.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/9clpforn41cgv4d7kl6vt6hfjf/18285233249.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/sixobukom.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160803f77077ce---pivokafepuguwubip.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd70e0e437---37727410417.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60c2e31b490b0.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/018efb13b647d0acd631b5a759a77371/18849332543.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/zowipuzosemaxabevo.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/13535679230.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_off000128a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A5 10664 bytes
SHA-256: 211e519bbdf74b5fd302b7e6d42f1c128e6f660498ad22632d20dbf6e26bc9f0
font_01_sfnt_off00014106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15918 19028 bytes
SHA-256: 852af46ac99a286f79a0cf295ac9a927562c884732a5818ec067720713c8eb0b

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