Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff85791c4c19ac8…

MALICIOUS

PDF

75.8 KB Created: 2021-06-28 00:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3776d71cf4a8ee2eef6a3de501493f8f SHA-1: 6441a7c3f0ccaa7a2dd54eb6a9504c727efbac26 SHA-256: dff85791c4c19ac8336d6647884492a00a5d3104d1908f1035082093fa68a1a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://infrive.ru/uplcv?utm_term=how+to+i+convert+a+word+document+into+pdf PDF link annotation
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/pc2od7544pvgp6p0mfau98jpfo/79808246261.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/7js5cojus14ecvbfsssde69a74/48750886265.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/33494138409.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34060ac4f2---xesopobopazunepalax.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ac1asp5k8je5htamrlc28fvkf5/tegobibibedibusudoxadan.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/cf692045a953f689cc8198734accf8d3/24099819486.pdfIn PDF document text
    • http://ubest.ru/images/file/56679282853.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b195d1aff1---nifajuwalaz.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/29455149187.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/gubolirizawixures.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14064bc934---sefizeva.pdfIn PDF document text
    • http://zxsolar.com/d/files/woxezukutirow.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16095bd3506aca---bulodupakubutim.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c058b7248d3---44037567102.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/67667190509.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1004fcb75b---72686395667.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/29068164022.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/69d1264f6425b1f78e30657fb28f1123/22171998091.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/kefureterugeronenizime.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcd055d709---jupudemulor.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/05232be929391f495818651396a7bc65/40918022614.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f0eef2706---42637403817.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ace5797abd6---xojefudexatoneziwutupo.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/24056145011.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/lagezasalizitovomabinu.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/kinevakuwitusa.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d65a8b8502f73c0023b9f34fe5eceb75/kenozepizi.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_off0000c622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 10812 bytes
SHA-256: 78c4815116d75261d9b2f4723612f806ec4b1c3602bde17706162d0fa67d2bb1
font_02_sfnt_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 16304 bytes
SHA-256: b68b75db754023c5b17e263c06b2e32e83b59d02b18dff763910a4f151fe7c39

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