Malicious PDF — malware analysis report

Static analysis result for SHA-256 86afcf67cfa1b351…

MALICIOUS

PDF

73.6 KB Created: 2021-09-01 07:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a88a09269274ca9530f297862949c0a SHA-1: d60dd4e1ac69b09b49785ac08d6409f7b82b9d8c SHA-256: 86afcf67cfa1b3517ce5c95c126e938457d63550e6b56b53d4a23b24615a2fa2
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The primary goal appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://africanhairbraidingsalon.com/userfiles/file/buzodaw.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abe6b52573e---71174524089.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/telonabapuxuzifatu.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca6988573---jamexo.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/67891009565.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/nexapopuloged.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/n9j4p4aam2hpqdqpd0et0fjvbp/nemijemuwetolozob.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/gozis.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/mukaxin.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/26526451654.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a96472e70---fepiwatidetutazesodonax.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/wabisipoluvazatusowefep.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/memajanuj.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/98767157261.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733a6044d9d---manekiveboxevanet.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/xifowinenudem.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/nopajokitus.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/2714773caddfe1768ab5c650fc1dd961/97843690287.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/62098192527.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094c86cf2fb2---tasexexudanezokunivunewib.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfc5061817dcd1b56012fa00fba3bc6c/sebipolubale.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/3625401378.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc72629a8db---87633825968.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/cd7698e5a38b286d9dc704806ba57057/82439367752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=carbs+in+arby%27sPDF 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_off0000be13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE13 17264 bytes
SHA-256: 37313a30eb2b00db7c01b004d70310217bccd3e83e3c7fb49a6844d20d7783fb
font_01_sfnt_off0000ea54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 10024 bytes
SHA-256: 22c835222880bb777326147927fdd057bbc1bd74ca010f97bd46081587f8b2c8