Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a63442d73cee08a…

MALICIOUS

PDF

122.9 KB Created: 2021-09-04 06:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6d983f0bfd970b59a26fda2196b58ef2 SHA-1: 67c054819871405ccd76f80e4d748df82c29e23e SHA-256: 4a63442d73cee08a4c2dcab0835ecfa0e2649bf980ee2be5f4274ef178023485
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of these links suggests the document's primary purpose is to redirect users to external malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793b35a31b3---91131817389.pdf In PDF document text
    • https://cabsfromheathrow.com/userfiles/file/zejopizuriji.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3fcf20a9bc415ad0dc1ce3ae62706748/sabalex.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ace242ce---45182419207.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/joguketuxaso.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/kupizovavew.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/83742324861.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/zujesoxiwapokobetowaz.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16092da90c7ac6---kezoxitage.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/9v3p88e1lljreh1g30eukpr8nm/24908373748.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094cbec8a018---75904304098.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/88599427746.pdfIn PDF document text
    • https://asi-filter.pl/files/file/siluravovufafefilizuru.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/j89mp4lplpf0e40g2u729tfuac/nokofus.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/xoladefuwibewakud.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c98c7ce44683f63d99e2d22ba44de2f9/xemuresuweto.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/21677470876.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/xezuw.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/tidami.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/bamilefoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf21d36e37---18763703363.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5l93b60566nn6d7uug73f2bcdo/vobeparev.pdfIn PDF document text
    • http://shophouse.info/images/files/vuluwefojizano.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608568519fe48---luxajejeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=princ%C3%ADpios+da+administra%C3%A7%C3%A3o+p%C3%BAblica+direta+e+indireta+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_off000171be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000189d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189D5 11564 bytes
SHA-256: ab4ae1ed80d8a962217d04d6fe904b8b446a9959025c372b2e337fc8eea4c9eb
font_02_sfnt_off0001a438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A438 21744 bytes
SHA-256: 353f0cd17fa814f6ec4dcb8584550e69299674846629f7687753e81ff3e6e569

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