Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbf1913927baf3c…

MALICIOUS

PDF

72.9 KB Created: 2021-09-16 21:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9710d507e6298845ba48b46d0e036326 SHA-1: 13d2d3f151d1824cb72c64c3a1fc8167f32c4876 SHA-256: 9bbf1913927baf3c1132c5d2a32f136893a713a2b7cc4f620be2b9e2e5ce7631
164 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. 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 'download' button lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mama-light.net/business_school/uploads/file/defodesuxunifikuve.pdf In PDF document text
    • https://stw-nowogard.pl/download/file/duredomejujozizi.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/mogatil.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/xojafozar.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/44382247408.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143068bdf29f---15143566141.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/jevoxasopepulatofozora.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/jopobapenadozebomu.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/42799460517.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/wetixovodepukizadekozupel.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/59121863620.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/dusekaki.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1b9053a6b3ab238950517c6ee42fc38b/nivuropowozok.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/wexerofomiwipozasegiso.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/27947461847.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/tinojajebowebewesaz.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/q14hr6qqq4gq83r6vh4q3jv0ag/futujulebed.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/viboxomasolagik.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/e4lor3kl57e13gv6inps1js3d6/41542317439.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/dudojo.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/nigadesuwafesowuzaxutupos.pdfIn PDF document text
    • http://dichvuhappyhouse.com/upload/files/tiwidakumujikigaxotas.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/11873146302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=rocket+royale+mod+apkPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef25a30b7---jedonekuzebadatalomu.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_off0000bbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDF 16328 bytes
SHA-256: a03e067c103dfc11a37eff0c9360ae4ab0aa46a871d251f6facb5da5a4bf058b
font_01_sfnt_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE09 10560 bytes
SHA-256: ab95d800b18b856e861e3abbf612daf2e6ed20cf3f3d2b9dba1bdf6c948228e3