Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a69a197df077c2…

MALICIOUS

PDF

74.3 KB Created: 2021-09-11 04:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0891e61559ac7a10f4b8200274d8a642 SHA-1: f0f084438870a3abe90203340b1ece5b73ead80e SHA-256: d9a69a197df077c2f17ad189e287ddd55bc59b82cf2f28520f1b00a4a8b9df8b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with a 'utm_term' parameter further indicates a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=need+for+speed+no+limits+mod+apk+android PDF link annotation
    • https://mallarpurnaisuva.org/go/file/10064303397.pdfIn PDF document text
    • http://ippon.lv/uploads/File/84652724013.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/koselimowo.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/55727504750.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/25975115927.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/27467873770.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/febelizoza.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612f49f6eb6a7---sedasebapejuxumapawozib.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/pikivubimetitoseb.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/lutekobovedekavimivodapog.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136962293db4---sujuridavimewusatenekoja.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/budenamumoze.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/22903498051.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/towekijevupekipavupeg.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/80781202316.pdfIn PDF document text
    • http://ducnhua.com/upload/files/10518501863.pdfIn PDF document text
    • http://protok.pro/upload/files/11112194218.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/vinunanebadikedipabukakem.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139df6554bfb---59379147509.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613647a27675e---79519676913.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/87685005276.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/20445375012.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/dba0de84e28e6244e46dd88e220836c1/63699736164.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_off0000bddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDF 10728 bytes
SHA-256: f12d1b2411890f48077df5a1e67afe5d803e0f6decb5b11a8462931997d8bdb9
font_01_sfnt_off0000d679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 17228 bytes
SHA-256: 4e90f60bfae24a34394ddf3fdfd54fa8e7cf0a06262bab6c8002cd77b7692a0f

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