Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6b2ade45cb9f41…

MALICIOUS

PDF

84.6 KB Created: 2021-09-23 18:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 194cff53c543f25e00e7f2c89b8c84b8 SHA-1: 132e3c0e4e860f28acd2bcdba3d17bd6bfda3016 SHA-256: 3b6b2ade45cb9f4113781dfffbe631fd5ecc928ffc53e81fe9c8825eb4dcc2be
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://greddy.com/admin/common/ckfinder/userfiles/File/pilonibuxezumuret.pdf In PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/38878673807.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614072429d8a6---kugawaguj.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/katasonorepomebavodabaluk.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0c7a33155813980e0263ed7d3676fa48/89454593753.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109011818066285.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/672532231c02b1db322c3dfd8052fa5e/pisewasibamimifusifim.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/karobam.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/52682057500.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/jikukekegogizemawusukune.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/zuxirawowetoras.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/fasuriruru.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/zizalaxul.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/86263305663.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/munazusozikavirunufoza.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/tazewubavopikozazakorak.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/74883633282.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/natenegetenulunovifi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/bf047ce50917695c5618066db3cf4c68/miwopepujiwaj.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/49062682611.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/nusizevataz.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/xorepakexiti.pdfIn PDF document text
    • http://zkpower.net/upload/files/sivadolipazipigikemaxezuk.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/fopojegofokefedalive.pdfIn PDF document text
    • https://profm.hu/files/file/46138266387.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/622ae64dbae100b5ccf875fc1a32555d/44474442006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=iphone+6+128gb+price+in+bangladeshPDF 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_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 19316 bytes
SHA-256: 5c71868a94315679ed90f6c669e556edf48dd16737d27a9a0065bb1439625e87
font_01_sfnt_off00011219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A30 11332 bytes
SHA-256: 2415caa634320e3cd8d53edc81c06d8e97adc55f140a424cec8c53dd847786ce