Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e91eea1d5f6489…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 01:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5573baf9d167c20f3c4ef0172abe0851 SHA-1: fa18594fcda6cb48141aa67a1810e629626358e7 SHA-256: b7e91eea1d5f6489d9213a96351d219bc184b9efa867528c445962f6b84fb49f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Several heuristics indicate the presence of link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://golfvillageonline.com/userfiles/file/genonufoniximuzujezizu.pdf In PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/feganefufutin.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/pafamusawixopubug.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/81156592454.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210901_135137.pdfIn PDF document text
    • http://sb-78.ru/files/file/83927500156.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/66758061408.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/88949940587.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/lonixokefixapufukajid.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/54033814664.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/50689963005.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76993c1ece95c8791662a2e056568b72/52125402305.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/wasuzega.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/pamoritofawemesixolabuw.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/vaxajaj.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1d0723c33cba018043c4ce7214264c35/58301347100.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134db137b7c6---59934930091.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/duwuvororixagepodidixid.pdfIn PDF document text
    • http://mosjob.ru/images/file/lebikezofo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3f57960dae633557518bf4c64edddf50/votelujewezanejar.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/funiw.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/fijokokazedanajefuv.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/32337107404.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/vixiduditukoromuvexulo.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/jiminemurubekuguvex.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/fivexipopozidapiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a440e1a3c---mofelenepadibogemep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=natpe+thunai+movie+downloadPDF 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_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 18968 bytes
SHA-256: 9fe7cd5d43854f6ef7fbb419d8be8969966f07406e3fe202b0c15788021f3530
font_02_sfnt_off00011afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFA 10616 bytes
SHA-256: 893f67628dd38bab5a4ad190cfc8097ca112eae85adc7d4d2904c223382049bd