Malicious PDF — malware analysis report

Static analysis result for SHA-256 14cf00953e6b8591…

MALICIOUS

PDF

87.5 KB Created: 2021-08-25 11:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8e135f8853691abc4bfbeb37c012d19 SHA-1: a9f7227c9a6e46a29bb1d9d6c785ef467a03aa67 SHA-256: 14cf00953e6b8591d5fce2b4a94ba28bd7e7e25bdf0e64fcb38c6edbe153cce9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. While no scripts were directly extracted, the structure and URL patterns are indicative of phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/443f58f8f2b1908fbd0ffb38785790cd/mojususewomubati.pdf In PDF document text
    • http://studiopassarotti.it/userfiles/files/vemifetijedutofiwena.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/fubugewixapuli.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/63ac3d71bdfcca36655f30e26b7d3529/12388272091.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3189863f1a---mamapotuxonufireme.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fee87ba482---nowetudes.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/99569106116.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/98609489175.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/8054674953.pdfIn PDF document text
    • http://jarosi.hu/files/file/baverusoperimo.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a81d4bf9e---8893513937.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/xeradejifi.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/sesogoteduz.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097d9dca6728---28485962811.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/f3003139408b65868698e7482cef9070/94039073424.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/53578384490.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/8567403200.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/48823716986.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/xufugupaxuledilev.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/hhhle4l6e59pkrb2vvviabbgq3/fokotejimofajexerija.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/saruzotoretat.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/mofasewisizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=freelance+non+disclosure+agreement+templatePDF 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_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 10936 bytes
SHA-256: 4fd1ea9d7f6936afa215be42546cd0af9a564739605cfb307302030d5190a382
font_01_sfnt_off00010c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001245d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 16872 bytes
SHA-256: a7ee5de0dce9c693049f54e0ae46bad2a69f927fff934eb43cfe2884b2149319