Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a78d3ab87e8f715…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 23:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d6592c2e3951de9551953588d82f160d SHA-1: abcb012a54e08daf6c2fd2b36cb92f9050f7826a SHA-256: 5a78d3ab87e8f715b8c94bbdb646278ea1c0d25e0a1aa9c6506e8191314647d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest it's designed to redirect users to malicious content, possibly as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--49s538bo8ux8c.net/userfiles/file/sinumukabavovutililov.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a61ce7624b5---86450618211.pdfIn PDF document text
    • http://liyangah.com/Upload/file/3310688252.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f94472e7b5---nokuzekaxusabefor.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608299901fa4d---46863236981.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210501190404610112188.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/13148502720.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/21642629797.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/xerukorapirilexevikuv.pdfIn PDF document text
    • http://babamoleskine.com/files/file/davemawoxurinozi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb3309a254---22418519072.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/sukodiwelipeluzosogon.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9688711a4---zogizajanabadu.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d7de735747a---15154566939.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/j7jpmhkbbiii29nl2nmnrbdlb3/35995915888.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ntfb4enne3s3r9iargk9ndnq14/dofisafizuseba.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/24282042146.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/xibomigetukomoz.pdfIn PDF document text
    • https://faprosid.com/file/kozobonavopogojekinodilu.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///91050620279.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/11608175530.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/mivakavuzepoxepitulupamop.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d906708a2ddbc7bb74feb4e287259e64/78144976100.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/nn7kp7fbi8f4ad7l8ocpaomr5f/39403401730.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/turirapelak.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210609030220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=green+day+best+hitsPDF 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_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 16680 bytes
SHA-256: d5cd88a043891ef1f53c9f40070ced17583bcc47f1fe7c8378219ab3ad1f5ee6
font_01_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 10472 bytes
SHA-256: 7984a5db77db0588e3df45c3370649617baf4491bbf54424134e27d7a3991c27
font_02_sfnt_off000135e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1