Malicious PDF — malware analysis report

Static analysis result for SHA-256 81483ec0a818d96f…

MALICIOUS

PDF

87.8 KB Created: 2021-06-29 12:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a32b01cec47896345a44054fd418f06e SHA-1: 3c4ff968f50dfa3fb258c030e465d6cdd2554da8 SHA-256: 81483ec0a818d96f3ca11b65dc064e2213b7b97e4ae23206e02e488cf655450b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and ClamAV. It contains numerous external links, including one pointing to a raw IP address, suggesting it's part of a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and URI heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a367ddfc3---vorosubirajobuxunasab.pdf In PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/zaxowejinedawu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/59b057a074b534f34152bd545ffe3f3e/52334462122.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a706f5ba0b---balevoxejagajalu.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/lijevozanoge.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/87198543563.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d5d3e5b0a---putovubi.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/51488997010.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/c216g335jgtpdoo5aip93emdjf/99643779330.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/tijalaxudowig.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/mllca405f5p5qqf50n816asln4/6096910466.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9d01c3447eb714beb4b1b336a78005f2/81856146996.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775f8fa68e3---57878589053.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/libedazoserinaguxo.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160910e7f7d1f1---70128150506.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16213760886002.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160932b26db946---90167204854.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/82882492569.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/barodavepebonituzupi.pdfPDF link annotation
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/93645956875.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/5c2dbjd840djqt2ahsnd3s99c7/81506044712.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/cd63pl7kg8si38pdkth1nmaau1/50709498874.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/73948603913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=almond+shaped+brown+eyesPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a6e8666da52f539355b04932c5fb484d/werodinatutilomukizivu.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_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 17580 bytes
SHA-256: d85b58bc6344c4f814de3a931f30b72cab9fedf29c87d791e77b6bb0cabcfe78
font_01_sfnt_off000121a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BC 10788 bytes
SHA-256: 3b10d2d5a20ba5ee71ea10b566918061f8b46f7b6e69e50cb4125673ac3b780e

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