Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c50825dc5a597f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-13 02:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d5e035e3cce47bc89f76aba3f51c9b16 SHA-1: 1f0edb3f26f56edc8c524dacbeb39f7868d8e4bf SHA-256: 65c50825dc5a597fad01ecb7694be79a62d9f4abc7e34e02455db9264cc5d777
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external PDFs hosted on compromised websites, suggesting a link farm or phishing campaign. The presence of external URIs and link farm heuristics indicates an attempt to direct users to malicious content, potentially for SEO poisoning or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://fpole.ru/sadm_files/pavunezalufesuj.pdf In PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/8177fbdd36c8e369cc61cba7548bdeb9/zefawarazavimusuvura.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/winigotutufovedijesa.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/25258609128.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/fulapabilenizolugum.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/joriboboniwijetadeki.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/994308059.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/lukajozegexumesifojok.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l6o4j2sd05m7go7vek3k2e4227/25914978648.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/jopafugazuniganogera.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/19405432928.pdfIn PDF document text
    • http://timebymtm.com/upload/files/13630260387.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/80242173713.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/15236151608.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/66834097909.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/mlk0jhbb2qra2a8a14rc46teo6/75422120714.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/zizanuxut.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/wolixobej.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210908181308.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/bijunuxebot.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/q4lspo8r4267hf7dt75foimosc/67958872339.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/35494041204.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/galokafefanerijifu.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/79386252367.pdfIn PDF document text
    • http://innotack.com/userfiles/files/39342779140.pdfIn PDF document text
    • https://novitas.ro/files/61115960516.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/22711155012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=1st+phone+to+use+androidPDF 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_off0000e919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE919 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784
font_01_sfnt_off0001173a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 10496 bytes
SHA-256: b3f1d40e2ea8b93871a37c271da56715566c53379d3b9e1cfb37b47207a62fe3
font_02_sfnt_off00012f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1