Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2445e4b8858afa…

MALICIOUS

PDF

95.8 KB Created: 2021-10-07 21:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fa2a263de8d5335015b5958e4ac24fc2 SHA-1: 66c9c5cc05b029b8fc4d7ccd627f4d2db282d94d SHA-256: ba2445e4b8858afa65dd0f83f044a42ca2a42d9b681b1bc2fad07fc3fb219406
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/92f187c2feb46bd9b94f0596b2c77251/85939299791.pdf In PDF document text
    • http://taxplus.in/images/contentimages/files/96220370237.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/46809295277.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/nerigiza.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16148279c4ab27---54084999688.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/kinazo.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/33402926542.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/45582315918.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/gerinanawan.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/lamixuditopufifetumefonem.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/37752303065.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/nasujokagemukefenixenev.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/93167831453.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/82127707245.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/wowoneputipawomidozu.pdfIn PDF document text
    • https://digireg.si/upload/80884333867.pdfIn PDF document text
    • https://clickbox.ro/images/file/4813651325.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/kowagovabunatapet.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/71134723507.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/85158108397.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/76120975003.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/4426301539.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/movuwokodinaxafesume.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/940677366a5c5db0a60a2844bef716a4/16060290725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=women%27s+rights+in+the+1900sPDF 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_off00010c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001248f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248F 10716 bytes
SHA-256: 775e9580b13556a4da82ab3c90277aa1eb27bf32ff7f02a030a3a9972051218e
font_02_sfnt_off00013d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D16 19996 bytes
SHA-256: 236d874a1bde0d315752f6141d1fef5f14d1bcde3d00d7452af2d4fd8efa0cdd