Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbaf09440ac462b1…

MALICIOUS

PDF

76.1 KB Created: 2021-07-21 23:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6b00761556650f6c2d7a1f4cb5fdcef0 SHA-1: d0c326307445227beb4b07905641838a0bd2f806 SHA-256: cbaf09440ac462b1a230fcfeb251a05808b3e6cecea500697b08b4e102b9e4a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. While no executable scripts were extracted, the nature of the link farm suggests the document's primary purpose is to redirect users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://envisystem.com/upload/userfile/files/82315992119.pdf In PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/famizugokuda.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210613104445.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add362ae404---68810183162.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/busajo.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/9781971135.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/nobigepuniposisulofob.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/nelif.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f76902856745b17dea6a905bf3ed1392/wusudud.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/13379688556.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc244e84092---fozavudo.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/13281214.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d084b4f316---zabufesadutelepazel.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/ratalananavogatuforasoso.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4e846c44a74b7fa46531d67054d2c0cb/42225751832.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7da6e12a9f016abfb19ed4b6e2a55226/vimofevesebojojeleze.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608103f568d10---99676423494.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/gererasebogikumepod.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/sofabutikokanirogosiso.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/58600987216.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/757978b6fbef78249befeea562673b6c/68012664486.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210517/210517054240710030k3dxgu18j56n.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce1d71f5d4---88915967384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sedgwick+county+jail+inmatePDF 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_off0000c79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79E 11040 bytes
SHA-256: 9119d74fcbf1c159d5e7d0dceb0a514a609a9e6e8771c18f2ccf598268740962
font_01_sfnt_off0000e12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 16072 bytes
SHA-256: bbfad025661aeb6b7f6cd42aaea4ce8b3ccc4e2c23d150cd04b358f689eec610

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