Malicious PDF — malware analysis report

Static analysis result for SHA-256 4482db77e7eb9e7b…

MALICIOUS

PDF

93.7 KB Created: 2021-09-11 12:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bc7656e22561e3545af8ac1d1ba41d35 SHA-1: 79cf141a0d06de90a17d8e3f0c4605410a8be272 SHA-256: 4482db77e7eb9e7bef1b0cd4ea638147aad4a8984fd88cdda6ae2f403beebe1e
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to lure users to malicious content. The presence of these link farms and the overall detection as a phishing trojan indicate a likely attempt to deceive the user into visiting harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161348b509975c---retinexa.pdf In PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/jigidijafelajuzeverale.pdfIn PDF document text
    • http://teplospectr.ru/images/files/44863161748.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/45006395795.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/33671915019.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/24044379000.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/dagivul.pdfIn PDF document text
    • http://word.mn/uploads/assets/50173500546.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/wafozeji.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/zasipuromegijisugudex.pdfIn PDF document text
    • http://pronobile.com/catalog/file/gefulinekob.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/xawetovimabejujep.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/86448911600.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/zugalotevavok.pdfIn PDF document text
    • http://kd-council.com/upfile/files/69048975049.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/gituxurulubopalu.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/tuzasejerudubita.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/cfbb9a33357d948b6cf12a01f06e47bf/vumelofugamisebokogure.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/xuwumusadekin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a75291e39---mekigimekelopi.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/wexukav.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/rixovumesekepokif.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/gimebigepuninadexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=watch+madea+farewell+play+free+onlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB77 18648 bytes
SHA-256: 11d986f6d8f2f9c3d0637c9b37e8f171d6cc41a639f0867ec08701fb1dfcc8e4
font_01_sfnt_off00011c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C84 17696 bytes
SHA-256: cae1b6124d41a2c38d8e6e97a9c956f17f7acfb1a9aeffd5c669e539e8298508
font_02_sfnt_off00013740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13740 10908 bytes
SHA-256: 579f83ca0a180b91d6e52b5a2f583fd77d5a8a1e64f71ae83a676646ce29bf09
font_03_sfnt_off00015058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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