Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a13e0dc9a565fe5…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 11:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a96fdb0caa0e17f603be5b00458e8f6 SHA-1: a60cfa226ebbda424da8ed445b2638fdbb70bb32 SHA-256: 6a13e0dc9a565fe5ba9d1339c58c5a6bcf4295f588c0061d90b9eb8ecbdcc8fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. This suggests the document's primary purpose is to lure users to malicious sites, likely for phishing or malware delivery. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=how+to+find+seed+in+minecraft+xbox+one PDF link annotation
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/sivinaboragebobidulefivu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/7658651b73d45d330e6ddfd48d0cfcca/zixabo.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/9a27cca958c52e307d128bdc2bfb7773/73545686198.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607da52693d17---25865692436.pdfIn PDF document text
    • http://polkovnik.su/upload/file/xositebejitefipirotune.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/wujozavafameve.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/22324136995.pdfIn PDF document text
    • https://badoza.net/userfiles/file/66205905079.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e576eee4e8---menopepozeviv.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/sofewu.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/18900561828.pdfIn PDF document text
    • http://www.toptehnik.si/images/34815896305.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/32714807524.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/guniletadinoxa.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e573737---rowowonawuxozuwa.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077512d2ac99---wuwokapome.pdfIn PDF document text
    • https://activepymes.com/pub/file/52439927502.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/31775597077.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6058149ee8---guzadipabowi.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/savabawotexumiferogajowo.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/48560046889.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/bkj14onv4csld3i7rcv7nspcd0/tajuguguxewi.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/3886216626.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607812ba0f9ce---taxojorunagifelikofab.pdfIn PDF document text
    • 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_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 17192 bytes
SHA-256: afea957f38159e3c6cedfd1de09ac9df31bf62d94d9eb74a747b94b713df0f8f
font_01_sfnt_off00010ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 10912 bytes
SHA-256: 2158ab0f613ffba797241687f49e554011aed8d00ab28789ab773c69073bdb56