Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fc20b7e192e1a7…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 17:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ebd0977e6c54f6768699ddc78abcdb7 SHA-1: dc470b39a8f4955dd27d0862869803619d7246ac SHA-256: 52fc20b7e192e1a74d38e0861016b17b75325d68adace68857d127439ca48ae0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious 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://whiteplacard.com/UserFiles/file/dakunezude.pdf In PDF document text
    • https://abcoegypt.com/userfiles/files/10678426538.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/wexubulazope.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///70328295109.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/42833710702.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/filijozududilo.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/tibewosemo.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/kovutakimufedaj.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e31822f1f2baf0412466a4ad421f13b2/wepafebemenojegum.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/44151448321.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/47054954007.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/84294379797.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161396b7a30c1f---lodapefapobawove.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/xividedab.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/10152793371.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210907_192928.pdfIn PDF document text
    • https://laser123.com/geektic/files/27656768978.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f79f89a40082f8fc50f65a736584f0a6/30772629252.pdfIn PDF document text
    • http://zenkatsu.dk/files/84465415857.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/63938531747.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d22f2de2d5---fejanibuvelijinos.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/53650491673.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/29524852165.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/47023130927.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/46178642821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=top+10+pdf+editor+software+for+pcPDF 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_off0000dd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0C 17212 bytes
SHA-256: 8c149f4470a8bb0ccefeb58a3c78fb65654322f30e9ec1cdbaf38eebd66be5a5
font_01_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 10684 bytes
SHA-256: e9cade277be642550c87d0c90ac062bd8009b222c92fdda3eeb55348c8b6937d
font_02_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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