Malicious PDF — malware analysis report

Static analysis result for SHA-256 71401d007a8a1da4…

MALICIOUS

PDF

92.3 KB Created: 2021-07-02 01:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: add24fe417da5da94428cd3e33a67d35 SHA-1: 19d0f9305f4ebc84b3c599629c72ae2138ef2a9a SHA-256: 71401d007a8a1da40255c426fb4198d2310fd37e4f39940ea7eaf0a35a667a18
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://nhs1980alumni.com/clients/878257/File/gotewo.pdf In PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b35b6b0c4b6bf154ea642e860629dedf/69911385793.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075738fe7474---jadofijuwololig.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/97572102706.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ueq34pf479jgv31bm3jpiu7ms4/doxulemimedajeka.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba5b7c0bc---25595880042.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/vuvotegizo.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/8jeh2chh8tg033kchmiiot19f5/xutafetikatet.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c386117896---gepotodotepugipo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae89e496fd6---lusujixekorizifevak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921ce8877d6---fizupiperu.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/30704753313.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/79157378342.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/bro8utq3luvtc8mik209hd1t9t/dopopobonemaxibodaso.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0a92c2b0c---60367335664.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/noririnajimitebapuma.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6a389507c---9793909554.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/10ef5b27fbe1c7525bc83002984da9ec/nikudaxulefapowufapafivu.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a570aa33f8---63062925700.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e22e988e81---podewogorolebogo.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/temudamorem.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210627_201640.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c0bb8fbb7---pedijalosiminuzora.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/bunawurajebudu.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/vixawavetilivudugotobas.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085d06605175---dowizaraduwamobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bread+pudding+with+rum+saucePDF 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_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 18176 bytes
SHA-256: 7766364970b7585b8bc0360d745d6dda9b92e3b8110b0ebcdf0046a4b12834cf
font_01_sfnt_off0001329c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329C 11036 bytes
SHA-256: 51bcb08f56546116ef8bfbe91addb82a95d7a6dbe250b5dd9612f265076889ac
font_02_sfnt_off00014bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1