Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1aa3c2bcf5e78a…

MALICIOUS

PDF

90.8 KB Created: 2021-07-25 10:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc69576405c518f145cb31162a9630aa SHA-1: 071da87d911f843b273316f5a6dff707d191ebf5 SHA-256: ec1aa3c2bcf5e78a5f5955e1c2fe9e11f721640e8f43ee469fd20378d04683e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable hosting or compromised WordPress upload storage, indicating a phishing or spamming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://fl-forever.com/upfiles/editor/files/1582514786.pdf In PDF document text
    • https://parklanehotel.asia/userfiles/file/63722541299.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/bemobafagituri.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/pubotav.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/68763924617.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/07842dde7333a043ac525c0fc7404931/tibozasekunadirozetorosen.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/d6qnii4bg3lef0jks2oimo8e29/papavujumafojiwazuviginu.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160788d6c6be89---tidezetarimijexav.pdfIn PDF document text
    • http://darstin.com/userfiles/files/xebolawuj.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/1jrtv80665n04nl8vie9gtpst4/20010169320.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/47ffed910677aafc63d9ed8396588073/55659514951.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d810ec5ae48---reremugaronixezazonafe.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3910cd11b1---ledefavelamifuwuramut.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3072e2847---datojofumupelovuga.pdfIn PDF document text
    • http://lucann.com/Upload/file/pasuvuxisoriman.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/posorakegorazibazobad.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/konozegilusumamef.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085301af2c18---19994070287.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/315df969bfc50e0aece3c981178c36a3/22498005297.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/67945838259.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/14359999401.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/80993334352.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/lezufelagajat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+unlock+shadow+super+smash+flash+2PDF 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_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 11180 bytes
SHA-256: be4e38d89797b8148336ab1af1b7072282dddf993b1f7129d7c6bab22668b149
font_01_sfnt_off000116a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A8 17824 bytes
SHA-256: cddfec4e3d1123fc956e860b9071f0469af1cf611e8d171eae4ee1e70a5c6dbc
font_02_sfnt_off000144fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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