Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb04035ae0aa522…

MALICIOUS

PDF

106.9 KB Created: 2021-07-22 20:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3a95dff8400a072093d3c1a124c88933 SHA-1: 1a637fe920e5a2b110049ecb74a23775002abf6c SHA-256: dbb04035ae0aa52273aa86a9de43331ff61096fcd5dcaf1035283a25f54afdbc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • 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.
  • 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://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/famavu.pdf In PDF document text
    • https://www.mds-horizons.com/upload/files/jarokadewemelero.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/59343608500.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/letafupuwiluroz.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210603111354_2007111981.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/8d81bedfd14bd94d83d3ccc4a50e2dfe/xoxogofajigafova.pdfIn PDF document text
    • http://centrons.com/uploaded/file/20979746460c65aa54aaa8.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e9b4c6b24e539d22b9030f089cf37028/zetumaloxa.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1626704125.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/57309284232.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4d653e3a1---zojin.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f65a345d9---xalegagadupebokawedojo.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/gubok.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/tidunagiz.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f3cb7b0cba5---50799808285.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609467a783d98---40387043055.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/71948871824.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93b04eb6d---furuwibaw.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/28009865322.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/foferoveripuvasaraforo.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/mobumalobifusugodifovi.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/89634159113.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160754a78adac0---rutuzulegosofepem.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b276dac269---99269328613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=101+ways+to+promote+your+website+pdfPDF 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_off00013d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D57 18028 bytes
SHA-256: 5ce4f584f79c8d126ff73c752d52f9c71217a80ac972ce80206b8fdeaf669b41
font_01_sfnt_off00016c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18423 11024 bytes
SHA-256: 33da47ba1bef0c011d998c7fba436cedec5941db5d6caa134ee57f2e113dd4d9