Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fcf472337e2d8a…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 13:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2645474e12e64ec43f63a62d333417a SHA-1: 31615b8bfe44c51c7fd1ebe8f9c0bb57e5fcaee0 SHA-256: b8fcf472337e2d8ac2a96c87af8792ec92adff946d172dd2aac59a31e5fa7116
172 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8979f538c93eb32f554d8dec135764a6/mepoluna.pdf In PDF document text
    • http://mayjack.com/upload/files/10845009022.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210501054158677733229rn5.pdfIn PDF document text
    • http://polipack.ru/content/file/figelusifen.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093127bd3337---12692703673.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/xefepudobisefoxibivimi.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161127eb039c2c---89516124161.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/87867486050.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/48sr3k69p8347a2eb5jtedqqhm/18702278676.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/timetizutogapegexovalinob.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/kirofuwavupifufiwazen.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/58510218394.pdfIn PDF document text
    • https://coluer.ir/documents/file/gedozig.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/24700368795.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/jamonurulunebubemupuji.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/talenom.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c486a8b3b88---rexakulozi.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vovugosowekube.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/dusirunek.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/175337a127119af9f9ec86bb9e906c35/12726120097.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/89305598948.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a89bf4dfb3---naguxatenevolovetobevu.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202108141602541600.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/63091484482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=class+6+english+lesson+8+question+answerPDF 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_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 11124 bytes
SHA-256: f06bb4d14a233a731048ed95e898e90d22d34859f4d638326eb3e60446b71f1b
font_01_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 18080 bytes
SHA-256: b5b2086c4b8ade738cf99e6fa1d650e259d7e1300853abbaef757659d51f4b04
font_02_sfnt_off000136cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1