Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ccf3ce676ad320…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 16:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb0c8130917287b62dbd34049bfb2c01 SHA-1: 4f19e1d8415b83c70e22f5aa69e0ba983d008bdf SHA-256: d8ccf3ce676ad320b815614ec5a6830c4f6d76a67ab604e84c1728307356bf8a
172 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a visual download button lure further supports a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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 http://timocomputer.cz/files/file/bovasowiloko.pdf In PDF document text
    • http://ingfrimale.com/userfiles/files/zibapatubagojobe.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/nidelewenugemi.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/47847489690.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/33123472227.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0fd61fc8---47828697178.pdfIn PDF document text
    • http://wamer.org/userfiles/file/latebepozevenujem.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/witul.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vekogarelobipo.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/zakurudotek.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/3257319298.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/bunafevekufiwufi.pdfIn PDF document text
    • https://aashianarealty.com/file/23052554472.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/46586307644.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/xoxozixikiriradi.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/juguj.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/14567263297.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432ef02d4b4---84732873819.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/43728212824.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/basutajufizamoguzep.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306b9f4573e---zizagulitawi.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/45670647662.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/gumejabo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2f23fcb7---vatomivekikodimavusasate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+forever+purge+cuevanaPDF 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_off0000dc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 10484 bytes
SHA-256: b9dfef08789d77d6b760450cfb0fb11884ae48cc47cddff1ca1c2f637b01b1e3
font_02_sfnt_off00010c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 18964 bytes
SHA-256: ab631dbe2b8da1d0ba9afa70c5fe3eb46efa46f10706d3596a7e6458cf3fa547

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