Malicious PDF — malware analysis report

Static analysis result for SHA-256 338714935c384023…

MALICIOUS

PDF

86.8 KB Created: 2021-09-08 06:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60daaea4e3ef886a5f595d819d21eaab SHA-1: 88eca73f3938d4c6013665d531629f6c956bbe08 SHA-256: 338714935c384023874ed78238de9afd2227b10bc73ffb8c73899543fa488a42
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple links pointing to compromised CMS upload storage and disposable hosting suggests a link farm designed to redirect users to malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/32977158782.pdf In PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/94653267749.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/67493356018.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/78262751423.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/fozoruw.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900fd6601fb---71419104923.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uqs074a0qo0mi070rv18dhhs12/29119720298.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/090f0783894beb0408653d64a1e5c814/17329698676.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088097cb2b8a---94164984908.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/g3at99d0glbms4rcpc873rsdlu/34965300376.pdfIn PDF document text
    • https://baongochoa.com/upload/file/84227288411.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/63040676147.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072e429dd475---bixanesozanafex.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/44439960113.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fdd322043---1456240843.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eadc65e9d---1582855341.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/6ma2dmsjbesreg29bb4gi1i942/pigejix.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/57128346362.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebe244e50e---juduxomokerolubekilefufi.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/pibusimavivanawedekoxu.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a976870ef---50305156525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=reflexive+pronoun+exercises+pdf+with+answersPDF 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_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 17912 bytes
SHA-256: bb0d233bd0b4be19a3e70d8ed4a9d96bf098c5a0a2b1a902029914359f4d35b9
font_01_sfnt_off00011b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B20 11116 bytes
SHA-256: a661be6d025fce7a43433230d87b5c3990b6f049f966153eae55dfb4f823a247
font_02_sfnt_off00013518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.