Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca88cf9108521b5…

MALICIOUS

PDF

98.3 KB Created: 2021-08-25 14:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 789d25d28adf01190f02c3964cb88f03 SHA-1: 93a01d091ad49eb9663c9ca5c49b6d79b83fd1c4 SHA-256: 7ca88cf9108521b55f1c9552ecb492c6e6c44cdb5d226727cfab0817729aff83
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ae62bf8a91c62618c56a2ef2d219913e/jujezagovirorofukezilaz.pdf In PDF document text
    • http://apismorava.eu/docs/xejesunarevubo.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/vinirikibefumudelorejiza.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8ba01fsiopks3rfbr07v2313h2/riviz.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/nebisuwazazuxifedo.pdfIn PDF document text
    • http://builderall.info/userfiles/file/69197321745.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/16886047934.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/dbqi0sukujg75gsgvstuqkpnd9/52220464843.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/wesomibim.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/uam6u2p3h9077mhc47l8norjr1/roponewirotemez.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1628866496.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/banigolatujoratabuxap.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ab76c5e6382---40898931967.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/22818060534.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160836c7ba9720---wuxunevevum.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/vixipiwulejulux.pdfIn PDF document text
    • https://nexusmediation.nl/files/94835320020.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/19980820663.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/87889928111.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a81d0de467d---vaxogafowisuvuwenos.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/ledujudisikukatukuzoku.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/57068364518.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/limisudugojekilijitevag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+dynamic+laws+of+healing+pdfPDF 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_off00011adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 17824 bytes
SHA-256: c5b57b87216e32407af6621fe775717166aa792d5b9e08891496643d95999510
font_01_sfnt_off00014984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14984 11032 bytes
SHA-256: e499fa601825fc2faaac59a317fee6c8fce37fde55469cd9fe5660d4fb36e6f4
font_02_sfnt_off000162ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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