Malicious PDF — malware analysis report

Static analysis result for SHA-256 723632e013957058…

MALICIOUS

PDF

78.4 KB Created: 2021-08-17 03:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e39d79eb027233395754296a61f6d688 SHA-1: b23a134dd7c440d8b82293a42bbbb689dd25cd2e SHA-256: 723632e01395705825ba3478c955c2f4a6272681fab66415270c442ecf2faae3
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised websites and disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO spam or phishing. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ffe8bc13768aac0c1732bb0fb2181ab4/22120614540.pdf In PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/27359935479.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/wezerofulebudawilol.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609277ca851ec---29290525126.pdfIn PDF document text
    • https://linoforti.it/file/xitalu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9fefa184d---67180365245.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/84717334859.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097c03f61394---7904680176.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/49314122466.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a383944ce09---tureti.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/91478555716.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/59212799053.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/tavotizutobaxerowuner.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/80966929400.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210517075032.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/51777632839.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/kefezajifipuduledumur.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/2d6olrij3rrjdl6k3l9mget1ai/kovulixox.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/difazox.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/vutotemukikazikifugaw.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/68534552860.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/wadogemigasi.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/20318571355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=yamaha+moto+4+350+manualPDF 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_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 10468 bytes
SHA-256: 09dcd0c69e2fb7969dfa690eb1442c7db06e9306fb1fe37d2ba91d2372b02171
font_01_sfnt_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 16672 bytes
SHA-256: 1d195c428f0c1eb65ac652882c7a4bb5dde4d1c0192a63048cce5a3e1958328f

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