Malicious PDF — malware analysis report

Static analysis result for SHA-256 73530e71b9fc7b6e…

MALICIOUS

PDF

82.3 KB Created: 2021-11-12 01:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cde591076850fff6842f634a5ba502be SHA-1: 43205fc6b4341c15790d0f934a0d651fb9d1a6f7 SHA-256: 73530e71b9fc7b6eb27b16260725a353667e900e4f0bd83a74227f919a236191
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content via these links.

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 http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/n9dafjoc3b1fd0gp1a2opf2iu5/votunadogaxatumop.pdf In PDF document text
    • http://monticellotownship.org/userfiles/file/39881243589.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/23269599255.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/13712503712.pdfIn PDF document text
    • http://zenkatsu.dk/files/vitidexutukopu.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/18459901659.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16167f4011edb0---91600009029.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/pubotabub.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021101721000165.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/tepuxeku.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20211025105808.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/53463432976.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152fbb02c7a4---18197229368.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/gojigajetuxekasesirawege.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/dibuxix.pdfIn PDF document text
    • http://artio.pl/files/files/dipegenetoz.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/nodarerexutikinavekig.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/67346669592.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/83452197243.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/wikofofi.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/2060968904.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/babifijaz.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/koladigifogodip.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/62685168473.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HTGXzuRVGb4/uplcv?utm_term=organizational+conflict+case+study+examplesPDF 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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 11364 bytes
SHA-256: 632341dcbb05ce52a4bedd66d64c50b5eaeeea115c3a01c8d42d874510439191
font_01_sfnt_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 18828 bytes
SHA-256: e3910125590c9a85c578234ce49b2c6af2675a8404869dc6945e0e81a4582c06
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef