Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfef85181b90b579…

MALICIOUS

PDF

92.4 KB Created: 2021-07-01 11:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d4bd3997e1c4003c2c3ffd3ef0ff52e5 SHA-1: 7822762c0978bae012ddaec2231564c5cbe54fc6 SHA-256: cfef85181b90b579fd2ddf655fb870e5becc40cd0cf60ef2634db90775f25d24
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/u2g02g2ll17n1m06l2kgta6ho5/81378967842.pdf In PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bdd2c27ba---59482113173.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/56a3af269879e0729dc9963cec6293e3/pukifuzedewavamotil.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/ledir.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/fetedemebasatalodudune.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/de7910b80c57b650c12d8a6972c2b1e3/noguparuv.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ctsnsokrcfhv6uvp4vtcl5uj86/bebanolopojukute.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3979fe3e3d---wilitak.pdfPDF link annotation
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/hefqm51nss4b5788noegim2b3a/8552388872.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608772dd18fcf---11205811401.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4ee400524---gapoguzonelixi.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/xegojaletasadaz.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/vemuranisutodotaxef.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/gl1l9ik6bp1de1bas7j4ov97o6/kobibijaxerusupoko.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1ea5ddfec954278ea319e492a22aa836/51310743597.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088a8965e159---8301239446.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/riwazezezotivi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a766197dc90---jeluwedakavamiludokikis.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba87d1ef5b---40628624650.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/9989336521.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/nefazodasaz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4683e64b3---zilazunaxene.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5la7ppc7blu7jv4dgt89guvrg4/63467459441.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7038a183d---8619340231.pdfIn PDF document text
    • http://epoetryworld.com/clients/53741/File/66012147074.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ieduei2gpr7lc8i2060rg0cubf/lajesesatiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+final+fantasy+x+ps2+isoPDF 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_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 24624 bytes
SHA-256: 99546f2aecff7e4c737981a4fafe17d43aa3ddbf67571dc4ca095fb7acf14302
font_01_sfnt_off0001317a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317A 10680 bytes
SHA-256: c828bd343a362b8e91abc3649f2522babdde160afecfb621f70c65e36dbb7624
font_02_sfnt_off00014a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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