Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9e53b29782b79a…

MALICIOUS

PDF

105.5 KB Created: 2021-09-07 10:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 583720a4df0231dc019042e18ba2e9e3 SHA-1: 9114f9098dad2197291914f05f6ef1e09129398b SHA-256: 7f9e53b29782b79a32039e369e9cedfa711fa5960877110bc7e2766dd33a8799
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm. While no scripts were explicitly extracted, the nature of the links and the PDF structure indicate an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://gfb.it/upload/fck/file/49040548197.pdf In PDF document text
    • http://parfumerieindex.nl/images/uploads/26869624538.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16099da4b53f4b---69165214477.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/82976073012.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/9242008958.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e25c8b867---71852355219.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/53425851337.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/gezila.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/wewilegup.pdfIn PDF document text
    • http://cascad-trans.ru/files/53841288835.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/65383700880.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/38494705423.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/56263378736.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4553c6d608---56308667648.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9eda0fb42---94363955761.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/bb6e200ccacc55c93ea1824aa1b37afb/51863240875.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/leridofedofenul.pdfIn PDF document text
    • http://topp.pl/_topp/file/dosamakibon.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/88650906095.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4d98c7151---66504553951.pdfIn PDF document text
    • http://strandedtattoo.net/file/xamiwunigadonogi.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/050efdfc456f803a33c472f41ccf2728/sotujezisemoxukesawaluso.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a572418cf47---79961132113.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/7021520748b24f03ac4573153a3f7728/pikikaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=american+gods+pdf+libroPDF 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_off00012d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001458d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458D 21640 bytes
SHA-256: 9c53a0d18982c483ce44daf50bd4c642c46f5a2d5e64cf56d6346fdbff893d47
font_02_sfnt_off00017de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DE9 10988 bytes
SHA-256: 550cb036ee62e5f52dfa714a5d71ff5ad78da6110b9e8e1778b79a50037bfb85

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