Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d26bfdbd90d816c…

MALICIOUS

PDF

93.1 KB Created: 2021-09-05 17:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1026895d6c07a9d828bcbc4a694368e5 SHA-1: 01127adea586fac35b34d9862a7012e6e7bdb055 SHA-256: 6d26bfdbd90d816c55b46cac48d1fe4b7de82617f356f679be3b8a0b7c047fb6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f5f5aec16d0a3f5815d53e29cc8fab11/81783733703.pdf In PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/41910176788.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b54576b04---pulefefufivekisidupesix.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/koviroki.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210817_25B0ECDED86DF0DB.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/47282989454.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-14/20210514090139352919.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/79287965113.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/pipasazamedi.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/kokapaxidujuwigo.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/bebda6647b6f3757e713e7992fd07e99/84724086583.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344e4b191f0---vifib.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/38f1dee6906cde84d6dea7f0407bd2ee/jigimixus.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/12627584765.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/lanijufadine.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/bodejudewobuvupiluminike.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e6239aa8---98404769912.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/fajebawutepevezagegob.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/getosuvurirugawu.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/11248555347.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/98125158574.pdfIn PDF document text
    • http://kotolantopeni.cz/file/busorevirenarifema.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877bdf575a5---lemoresagar.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/wodepadu.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/savijule.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/92445448745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=acls+pretest+code+from+manualPDF 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_off000103c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 19256 bytes
SHA-256: e60756733d1403cb7532a64e00aca2a6058a06526a84ac46b0ad0123f5bbde5b
font_01_sfnt_off000135f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F3 10768 bytes
SHA-256: f31faaea41368d6c2b7e6f268892d889d2bbe8a2265b751ce49c802f1c71a782
font_02_sfnt_off00014eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1