Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab10b213da7b17a4…

MALICIOUS

PDF

77.9 KB Created: 2021-09-09 05:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8505f5c27a0f7c148ddcb7b0566a8404 SHA-1: 9bae6723b4408d1a7c04c8b290ff6f60edddea34 SHA-256: ab10b213da7b17a468487c638dc41ace23a72957d4671a57d35500e2cec1fb9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple link farm heuristics reinforces this assessment.

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 http://rothemtour.com/FileData/ckfinder/files/20210901_69F74A305B28C265.pdf In PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b68e1a9e---maxes.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/67883678766.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/fusiritenopif.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090516461473499.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/badaxatalokeruguzulekon.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/19455945244.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/pevoribugajidor.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/rotipirenigisogek.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161328caca10d5---85730294747.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/54205049299.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/01nappu5n404aqm4rud4l8ueg5/titifutenexosuwupawu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613738a12f385---63829531302.pdfIn PDF document text
    • https://finliz.lt/i/File/kogulavafoxofimema.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/53477264252.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/57682418819.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/kodidiv.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161312aa97c8b6---zepuruzebenabitugibada.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d3ee78f1bc5890db43ba41f82d133508/50608203271.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/65774294929.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/naveburulum.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/lefawofigivotuvuzeseb.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/85218768292.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/futenarifumigoraza.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303e8858a91---denixezuwojibazes.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/volun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bus+simulator+indonesia+android+1PDF 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_off0000cbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBED 17632 bytes
SHA-256: 3d56e0a17977ba776341876085769f3bed2dac9af914e7364185b9d479ad1e6b
font_01_sfnt_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 10616 bytes
SHA-256: d8227a23ac27f5b78e9d539a2030b10fc8115db5a0db1aa4f85a614646548596
font_02_sfnt_off000111c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1