Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c67442c716b748…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 20:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f8af734c00e115bdfdf30d75907bc30 SHA-1: 1d83795d431b780a4dc5e958d4dd1202ae9e6b66 SHA-256: 30c67442c716b7481d479693af696b5bcff8539d98f473a392a9e14c8af30aa2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the interpretation of this file as a component in a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=mha+s5+ep+4 PDF link annotation
    • http://langeline.com/ckeditor/upload/files/jipomomemolopob.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/basadufijijidemosewi.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/69429841853.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/zeketokefuxewiletisa.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/mubazudikukopav.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/bulikiwafelizijitagaxu.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/vunoz.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146755004c08---83500577468.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/47446346892.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/zadijamudivefug.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/kejevugugop.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/teduj.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/53344088439.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/31234897272.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/98629247915.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/733716676.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/19521325605.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/dujatomanusezofanutuw.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/vb0l4rgc1do4cu7d45dk0tace3/vomafik.pdfIn PDF document text
    • http://oilspecchem.com/files/81329762289.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/94078234865.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/podosovirodavav.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135162e41474---vupijixifavozimupadopog.pdfIn PDF document text
    • http://halanmilk.com/upload/files/52011804104.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109100423019197.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_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 9996 bytes
SHA-256: 67adcce678a560a0a2aefd99f8fe0a0380244b36787edaf83c298f1fb86867e0
font_01_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 18336 bytes
SHA-256: e029272810dd6ca31b00cdbe7be859a68c734be682d8bae10579063267d1a7f6
font_02_sfnt_off000127e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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