Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a9c7bc860888df…

MALICIOUS

PDF

71.7 KB Created: 2021-09-01 23:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bca6206f5a1516e0f427e8bb32b25831 SHA-1: 7dc6673ada8d6b76e8a653a2d42fb523b629900c SHA-256: c7a9c7bc860888dfc05729e4ed5b9e2676c7bd93e4e3fe6b9c606a8d84907c67
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, likely intended to redirect the user to malicious content or phishing pages. The presence of link farms on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610caae278de6---44471807384.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/apgn32trhtalskoeg7uemqs2ce/xuxudaxarebezedakepeko.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/lofuf.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbbc4c770c---19639212291.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210819125612_768793870.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/36032608218.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/tijasemaxululub.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c164faef47e---romonux.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb8787e0f---70672495700.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/53503142807.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16211707702393.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/3f70d7f8db77baf770ae78f97c38010c/41044904202.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/sovorole.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/83343758796.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/48371073042.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/29261134472.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b4cde022c08eca59eef7b7070921b647/85091269082.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a706447811---40457909441.pdfIn PDF document text
    • https://memoservicesrl.it/file/18074114649.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/3706613645.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/5321907912.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/gibedapatowajigotobifabun.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/1356247d61ae8c584586c22fa0273ad0/daxizizesoxefopo.pdfIn PDF document text
    • https://yodobashi-church.com/53086461383.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ab794ee94---bazodorenosubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+to+do+if+i+find+a+batPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e43cdba1136---sinesexogedade.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_off0000ba66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27D 10140 bytes
SHA-256: e5189243c4ddb3f0a27592d77a9735892af6a14b77cdb6d586f1364f31e6b00e
font_02_sfnt_off0000e90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 15808 bytes
SHA-256: 791002bf1922e05e55bfda1ee9881ffa73e2a8cd0cacd0ce68c99b88bc2ff639

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