Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e0306ccf7a76a8…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 06:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 956f48c6b541b352d1c2f33d1212b951 SHA-1: 70b07371389a6a19eacf0e769055faeaec4fc95f SHA-256: 13e0306ccf7a76a860b2512ae0439f5e4554cc3e521d796b0c31dfa87cfc5a54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://ajansnigde.com/resimler/files/82664206319.pdf In PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-5/20210905175540861575.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/sorupodiwunuwakeko.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c42b6d81---7191901119.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/woxuwijojuweva.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/mamogiteji.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/14064124286.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/68335482523.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/89433332004.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/34423646618.pdfIn PDF document text
    • http://vtaky.sk/media/file/korata.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/degagatamaruvap.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132112e32109---75381663012.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d58cd3360---jilajuvenuzo.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143c9dc543bd---bowiw.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/xoboduni.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/35718023058.pdfIn PDF document text
    • http://chapelguild.com/images/usr/48096106219.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/92605032838.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/bamojufunanit.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/66646716966.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/16005425434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=avatar+2009+full+movie+watch+online+freePDF 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_off0000cc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2A 17888 bytes
SHA-256: c65f30dde0f30bb50a5a8096b821123cb77d4c79d39e31de7761797bd089def5
font_01_sfnt_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 11076 bytes
SHA-256: af8621a899a92cd17b44c9c47fcc9e16958f0532711a2d8d248ace4bc886b137