Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2fccca53593805…

MALICIOUS

PDF

98.9 KB Created: 2021-09-03 02:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 285ec8268b68c425097e0b36c4347355 SHA-1: de15bee43afd40aee7dc811e08b8e218f1f49130 SHA-256: fa2fccca535938055a148496e4e4a6eb7af1bdf4bda82f1d434a3be6f839a283
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The file's structure and the nature of the URLs strongly suggest it is used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/5477494249.pdf In PDF document text
    • http://adance0112.com/upfile/editor/file/84304242003.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b6886fb436b79434089fbfb1374c9aa0/20198599591.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/756b1842475fa5328f736b51e73ee45f/97117738904.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6e88a4aeb---49190130456.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/41334144981.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/80488598020.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/26851771596.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/rakazifuwapivevogidezujup.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d19ce8efaf---suxetonevujojer.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/480938e8d7ca4031bcde108563a07c84/rerimudiwojasavadokoxago.pdfIn PDF document text
    • https://udruga-invalida.hr/files/nalifux.pdfIn PDF document text
    • https://armenia4d.com/contents//files/tofukupajajawopuw.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15ea8995e4---gexulevuga.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/xiluxiz.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ab1915427b919cd8b01a01d63b211110/wibugulul.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/2926126290.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/2f2e2tgtfh76pisnjdjo2d03ac/79001692627.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/8002119180.pdfIn PDF document text
    • http://araonline.hu/uploads/file/nuzorekurovozugofowa.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/79909878161.pdfIn PDF document text
    • https://adikketiga.com/contents//files/taxudokumovupejam.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/62819010699.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/82608760786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+scientific+revolution+crash+course+history+of+science+%2312+worksheetPDF 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_off00011c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 10676 bytes
SHA-256: d39ea48667d1f09517fdede79ffdfed7690075a55ce46d89ebe8cfc044b6971c
font_01_sfnt_off000134b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC5 18832 bytes
SHA-256: c076ee5086eef6440d8aa7ced1489bc25818c14e77f777d619eed25f34ee08c3