Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5224a803eb74a5…

MALICIOUS

PDF

86.1 KB Created: 2021-09-14 09:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb5049a1edec8e8c16391b156d0fc5db SHA-1: 15c39a657dd49f6b892e618458cc0dfafc7e20fb SHA-256: 5e5224a803eb74a53be13def29751d3634e92ac4ebf13432a287a793457033a9
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 various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

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://irlanc.ru/uplcv?utm_term=hyperlink+in+android+app PDF link annotation
    • https://cemb.ca/upload/editor/file/34218595420.pdfIn PDF document text
    • http://bscartridge.com/pic/9090116006.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/jokikutepuno.pdfIn PDF document text
    • http://blueyee.com/upload/file/042029082195.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/fixaxarenaguripo.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/6514003454.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/84651555991.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/megava.pdfIn PDF document text
    • http://skene.es/userfiles/file/41273214965.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/93122864229.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210906_CD6943F140202451.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6b43337f1---xalukakeze.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/263726304.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161402c49a8f31---725845249.pdfIn PDF document text
    • https://purefeeling8.com/data/file/gidubekuki.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/03374ca8ef4cc1c19ad5335a92735993/25094890301.pdfIn PDF document text
    • http://goref.ru/files/file/15944610713.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/pipuje.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210912133645824334b8nl0.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/wamanezetuborufarobubapaf.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/pudemuvo.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16315223161602450409.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/xositugo.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/32675781213.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebd9fbae70---fupaloxopiragora.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_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 17180 bytes
SHA-256: 199f86fdae901f753150261eecde497be207f96603b8b9cbe201518fd26d1785
font_01_sfnt_off00011b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001334c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334C 10316 bytes
SHA-256: 5ce91720690c3c430f474d04e9f3fd7cab5fac3f3f4a995b51cfd4efd72bb47c

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