Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffac971e2f54807…

MALICIOUS

PDF

77.0 KB Created: 2021-07-27 10:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 92aaa8dafad1db93fe69ee665c6e7141 SHA-1: e6c9f332e0b0b9b50f8983bb4b44c281eb9a8a45 SHA-256: 5ffac971e2f5480753881ae4516c131e3ba66e72a69cc6088f545b769ee0f8af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bobiniauto.com/userfiles/file/28491094500.pdf In PDF document text
    • http://artstudiodesign.it/userfiles/files/zenedoxelekuzedudap.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/rufeka.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/wulikubidigebuwivonag.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a8bbc8a599b4239336995eae0205052f/resosavifaku.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3491ac3ece804ba49f3a8462649833d2/nujogitujosodufur.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bf414a503e56829e401dcdf3a86242b6/bonevabejejebudi.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/soresajotapigamedad.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/45482391136.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/kfa7742qlo08i6lrgtncmc5877/7353282430.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/7sbd6t0u9rqa62rojglqvelh23/84484680067.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/rakewit.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/904509fc9d16fa0adfd0c73135e83d75/13377199533.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8e04f1a00---xizariwime.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/75130886152.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/d1493e3c5e5e1b5307273a5bcc7ed472/disuvebofike.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/3de1e560bd08e628abd8c351035c75ea/mivurunojutuniditi.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/dulotedamifidejojemamani.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ri8dpqbatchg134kb490787vg5/furozimesoze.pdfIn PDF document text
    • https://oliogalanis.com/file/famek.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c99379147---50035125758.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/jadurexovopizug.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079f339b9f77---vamamibolezujusomigamizi.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fd2b4409b---rubexonovivejajovawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+connect+terrova+to+lowrancePDF 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_off0000cb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB92 10104 bytes
SHA-256: 8cafcf0bb49e9d3d0de5efa55d53329235eadbc0a1db398bc9ba9d73bc1be251
font_01_sfnt_off0000e23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 16812 bytes
SHA-256: 99c8899e68aacbbe14b2145ece708fa2369e1194c4e6c64671c03cfb770dd8ef
font_02_sfnt_off00010df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1