Malicious PDF — malware analysis report

Static analysis result for SHA-256 3867de21b5559e34…

MALICIOUS

PDF

84.4 KB Created: 2021-09-14 04:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b2921d072fbfb44909e474c877c7e57 SHA-1: 7eb7343c79e20f9ee15d82621bffd459388953e4 SHA-256: 3867de21b5559e34a63de640a1835e8996723e81f1edfc1b6e7e8253411338d9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://latiendasegura.com/contable_prueba/userfiles/file/48680430551.pdf In PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021972056384205.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613eaab11a8cb.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/92294348930.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/78459856440.pdfIn PDF document text
    • http://fohow77.ru/upload/file/56887018227.pdfIn PDF document text
    • http://bwc.lt/i/zavin.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136d2f0b3c81---solezubewipoxarovawa.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345f25d2b44---88795205469.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/bemasetenilakexi.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/69672434083.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/33178027915.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/9218b32b60e7298ec003f7985b10b922/36136585882.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/84119623629.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/14152736527.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/jezokan.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/vudutamijuvakikize.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/sugedunekenuv.pdfIn PDF document text
    • http://safetruck.gr/images/file/sonididanapubulafekad.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/83909291921.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/47539344323.pdfIn PDF document text
    • https://europartner2.pl/uploads/jixamo.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/68935412171.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/jatedubilaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+a+live+wallpaper+iphone+sePDF 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_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 10672 bytes
SHA-256: 235376ecca5a520628224cea9872139e86cfde73614327db473f0d2473b97e19
font_01_sfnt_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFA 19724 bytes
SHA-256: 0548e2cb76f9e66df4fdb077f4b18dd13d284a5ce6894e88f4c88ecbf90fd47b