Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1272bb4b74ad9a…

MALICIOUS

PDF

71.3 KB Created: 2021-09-08 11:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 71b7eacb188c3aaa62eac734f673493a SHA-1: c63e74faddac0a572b58636564d4418c9f99959c SHA-256: ca1272bb4b74ad9a1faa0e43332bda67f359ea34730808176523809c98290db9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to trick users into visiting potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=asurion+affidavit+sprint+pdf PDF link annotation
    • http://nirmalapublicschoolerumely.com/userfiles/file/26178348860.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/zonesutigegakotaw.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/62607763936.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lodola.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613760c7e7362---23214541883.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0a2ddaa1e---wenejapilonivifobejix.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/59681777146.pdfIn PDF document text
    • http://carbonelite.ru/file/pofiroluwe.pdfIn PDF document text
    • https://best-label.com/upload/files/81962726766.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba99a84d7---rakuw.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161138e69538f0---75650762314.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/fba7e8adea8100609abb8c78e02fca72/tuzuwuduzimab.pdfIn PDF document text
    • http://capital96.com/userfiles/file/pemunozurujotutebujuwafi.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/51604074901.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9db83b3e---71650392086.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/96169984776.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/debilizujajuk.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/b85655644df1b57b8d9a9c5e36715682/3364199431.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/79509550699.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b96a2b27bad93087091eb2f308dc5a48/899309662.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/degagexodadalasesaj.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/m4nlcnjsuf34rc55fd3lusugoj/sutewasolinixizude.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/90874787827.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c2ba67ce6d8106c80bae2f1dfb6f53fb/47914653147.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_off0000ba99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA99 14764 bytes
SHA-256: b6802cf69f4c20790b1ad6b167505dd5bd89fc2d7ef951dd094a59955aafe80f
font_01_sfnt_off0000df7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 10460 bytes
SHA-256: 2f50344850fe9394556c52e208472d0867071c838c376894fb3c6fb4889549c2
font_02_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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