Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b51b04f23b732e…

MALICIOUS

PDF

74.6 KB Created: 2021-09-02 13:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47736e96d494efda4aa58822df41d9bf SHA-1: 32fe3ee9ec47c8d909b1933fa45084f1e03b0cd6 SHA-256: 86b51b04f23b732e6e3df28778d56d6d977b7316d67417abf2defab50eb0a741
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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, directing users to multiple external URLs, many hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://trunglamdecor.com/uploads/userfiles/file/54403645725.pdf In PDF document text
    • http://zzzwchem.com/upload/files/walodebilabexazukulepol.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/zixozesigine.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/eb7b35ad684622adae05f40ea6ebb0d3/50125151711.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16107d40ec8133---kezotivugawajexozazinol.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa98f21e7e6---rowuvotafibekuvetevurubix.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d046380f7c---14507212398.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/77237412958.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/tetawuzepameziwexezigevel.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/70079720918.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d3c4303a4---53553776974.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4c6efe7bdc69a63aee07f6150f4c78ee/6074744044.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/fuzipigagokaxavujebapaf.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba0d75d6c---18709539177.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/silowutosesoj.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089df5dd1b68---53289755451.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/norojunagufulidevig.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/mutisosejosoxefedupoli.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b70a2b8477---65783797379.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/6e202b05551e52dafe043fbcb2768f80/davajuluzugakefim.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/donojepakugirevakiwon.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/52b0d9ad11b6a00cd4ba7fe6906938cd/likowujiruwegewemopid.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/87c5834c79d23664753027296ad4be1b/lapadigukixiwo.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a3d6d49d---89780653849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=robalo+r242+owners+manualPDF 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_off0000c163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC163 10648 bytes
SHA-256: 439dce4a4bdebe33f6a89693274235c85160f5ea1f84baa1b745ca43db4aebef
font_01_sfnt_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 16420 bytes
SHA-256: 32241ad4928b013647bb1836bf72b0ef4efec6d3361184c2683e0a30add7767c
font_02_sfnt_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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