Malicious PDF — malware analysis report

Static analysis result for SHA-256 33193da956d538e8…

MALICIOUS

PDF

79.6 KB Created: 2021-07-04 01:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: abdb4cb9f4740b709c3a250179731486 SHA-1: 6bf1ea21aeb54bf7fe55d6daa2fb24898437ddb8 SHA-256: 33193da956d538e854997bc12a6e50327cef52180cb03702685246970cc48e22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to download files from compromised WordPress sites, disguised as exam papers. The presence of numerous external URIs and link farms on disposable hosting suggests an attempt to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://chcial.ru/uplcv?utm_term=scl1501+past+exam+papers+and+answers PDF link annotation
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/6f844ec603484c4d36b0fe015e3ab26b/dadazozejubegoxamepusex.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/rovudesonemakekosoridoti.pdfIn PDF document text
    • https://cncunse.com/d/files/zijapemejumujopaw.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804be8e64dd---50764641793.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a1e74afba64b7e2890e3ec9e277c4fc9/dexulufokapulajimeda.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2a2j51uthi6u29gt7bsbl5h7t5/labaratemu.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/37925819769.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/83c484e9da265c6ff7dec93ef2161b13/todopotekokan.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b3f458677---renufiwilogewopixapel.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e1feb8a62---xuruxav.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0d36df45f---wulanerazuv.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/54beacab65e60060575e8a083dfcd575/zebizofof.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/dapibokoxojix.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/b5hfvtedsivqnj3eku52jd2001/bixekavivexav.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/e3fcfc0ec3e54f2a54664e97427424f5/dumegivosukurususefo.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/8qosgug7vv6kbn5qh7fpvsj04f/jivumij.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162496604350.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832be97a31---99083749937.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/29724797483.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/sifemeti.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/nututubufazuruz.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/42620278383.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_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 16972 bytes
SHA-256: d984ca2fbada595b6425cb98453e90d3a51d6d633622d67852974ee1794b5f0a
font_01_sfnt_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 11032 bytes
SHA-256: e8ff028c9e56f144a8b2cfe472e1fafbb4b0fbd39598f8f68cbda62926d9617a
font_02_sfnt_off00011911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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