Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1d3c97aa6fd8a9…

MALICIOUS

PDF

87.3 KB Created: 2021-08-01 06:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a750c96fffbc49bc7aad788405375bf6 SHA-1: 91e3e72a700059dbd371ed501dab283a9f6465ca SHA-256: ab1d3c97aa6fd8a9cab91bece08197ac33f29c502af115c9c80dd2d5b5e7341e
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to potentially compromised WordPress sites, suggesting it's designed to deliver a payload. The presence of a 'download button' lure and explicit instructions for a password-protected archive indicate a phishing or social engineering attempt to trick the user into downloading malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hodori247.com/uploads/files/tozil.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0e47c0b2---rorebamodimulufonibutax.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/xurexapufijajufareso.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/gigupomanituzitixebu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934cf5e38ce---vuvaroxifopa.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/49471321790.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebee1e3a79---35457817806.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16098f61903811---99540340723.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4f5e4face---53934749397.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/21447471759.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d427330dda7---nanewexofep.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/384badcfa36f9e324990cbecf7c267ba/suwudenapavo.pdfIn PDF document text
    • https://angkagenap.com/contents//files/filoger.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/xewulivuketoripemibinenof.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/pinibesuz.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/gewuxasorog.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/nilimuxagozogas.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/kazuributinokedig.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/vuvofikusidigo.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ef7757f6013db1a5f7bc56a12e1d8f6e/91404314282.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/73299688491.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/85412588866.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/3794920694.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/80604413351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tp-link+tl-wr703n+factory+resetPDF 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_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 11108 bytes
SHA-256: 3420d7eed50a4f768d5cd4efa2fb73772f8dc93809d7958e2a125750a7075a51
font_01_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001223a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223A 17100 bytes
SHA-256: 4da10bc6d514d12bdfe073384a75f6c747e512de91236664a46b770cf625ddde

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