Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd5a7cf6711c717…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 21:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0e6744ec6db2d81af42eabdaeb2360e1 SHA-1: 0ee93e5c806f5adb34112c08d3962c78b54018ba SHA-256: bcd5a7cf6711c71727c7a850fba53f4d7dbbce2b640fff766c1f7f8a1b118afd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://zoldjogsi.hu/uploads/files/bolut.pdf In PDF document text
    • http://abnig.friendship-match.com/upload/files/21405279984.pdfIn PDF document text
    • https://landi-bg.com/images/file/8776227103.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/808710542621630515938.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/82933202593.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/32156602403.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/lurag.pdfIn PDF document text
    • http://seamacros.com/upload/file/75677576886.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/31244589336.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/50355961262.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/37817430683.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614594f22a32c---5789236129.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/reporewopuwuzuwobizudawug.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614d97adcdb4d---28622824442.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/putavo.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/96877026192.pdfIn PDF document text
    • https://intersat.lv/files/file/9896320822.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/abe2b2696288d22c8f96831276b11208/13584829276.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/sutonenifobul.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/juvanadifesa.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/sorodawujoranaxab.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/86959469985.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/108498673761443f3b554e5.pdfIn PDF document text
    • http://thecuriosityshot.com/16382494653.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/lazal.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/vitimizetuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=active+voice+vs+passive+voice+in+writingPDF 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_off0000b39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39F 17016 bytes
SHA-256: aff46915e26adc0f2a19600062fcb708e4b7655d613909a372edb2a0d03bc5a8
font_01_sfnt_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 10636 bytes
SHA-256: 82149ff46ad59a9778493e1ab74ac6ed53a46ffc7fb83789d4982c4536f30071
font_02_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1