Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c854a5917637ba4…

MALICIOUS

PDF

79.8 KB Created: 2021-08-30 16:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e94996a38411faa2270f8a14d684faed SHA-1: 33114f738c80d14748b78bf9956cee0c23f1cc05 SHA-256: 7c854a5917637ba42928ea214da2134d3d6c6ad4017bb471c43fcdc3487e5e9b
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. This suggests an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://questyme.ca/userfiles/file/39075354748.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c08aecf88b---kogexuvifodelow.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1cafd0231---susivolapatuzo.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/lidivubukopavaruzir.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/80569119304.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/veliladimaso.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210822095933.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/xikenojetofesoge.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/9a94e7529d2d533fee13e8634645fbf9/15029592982.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/livugopu.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/negiranowun.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b81f32ac46e---12667868407.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3f30581cb.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/47kh6m12brc463c8i39gambmdv/72114521561.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/nf8js55tii72d7alcbe04qvv4i/bojipego.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/5352803905.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/lirakaxa.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/terabebuzovedutebuza.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/r3v3ld5tl73ghhrajlngsblit7/56247362904.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/76099208665.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/xumusunepifinipaxodolan.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/wezurabos.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baef8dac271---85459975916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=which+of+the+following+is+a+covalent+compoundPDF 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_off0000cfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE0 11212 bytes
SHA-256: c6a2fa80bfd616ca12885c5ae267bbd628e730a13d6a767c518e4bc40d9dbf8c
font_01_sfnt_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 17988 bytes
SHA-256: fa4c7e770680b82fffd9d40e031957aad134cb693e6a614ccbb09ffb5522a543

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