Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d9eae46e83046d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 23:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 402a97a00d790e4ca033bc4a906d1eea SHA-1: aad388dffdda69f2338c5067d79c2fdf451199dd SHA-256: 68d9eae46e83046dadaf14504426ad3e8e1b77c7a286eafdf46f219eb57b60dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads. The ML classifier and ClamAV both flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous links, including one disguised as a "vpn apk download for pc", suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nhuaduongnhapkhauaz.info/upload/files/55963260571.pdf In PDF document text
    • http://slmj8.com/data/userfiles/files/bisin.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/lizulu.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/puzif.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/9ffba3959da2c14ff99a301bf46e4808/fefojatekiba.pdfIn PDF document text
    • https://slotpt2.com/contents/files/dotetoseritojatagomib.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/nuduvekej.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/64172245828.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/41465720897.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/7394362450.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/34870234424.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/mabowewekonubabonebaged.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8bb3fe5765c9a35993a027b2f93e32d2/4927655638.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/13044615011.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/98882246922.pdfIn PDF document text
    • http://sjhtractor.com/d/files/38678780563.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/wasaropufukoji.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/sokozubosomavutazagokikog.pdfIn PDF document text
    • http://offerparts.com/upload/files/56715524025.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613122b97c095---tetis.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/midonotevekam.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/38c154d73f0f162b7e035e0f00f8e79a/derasopiwepedire.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/zijezew.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/nijazodakamogomivufa.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/41474362377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=1111+vpn+apk+download+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_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 10320 bytes
SHA-256: 3f8f25275d2726630b72c958640255620dfde92667f36a4998b3780c0ff32d72
font_01_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 17880 bytes
SHA-256: 2a6c3f94840f75d2e2890cfab76d6b4eca8ae89213a023670c7f28918e17fd54

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