Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16a9f3bcdd113a4…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 17:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6cf349f0584ae2936089e6694b7c6f91 SHA-1: 9147ea1ba550aad385d8048d7a112840119b2549 SHA-256: b16a9f3bcdd113a47fabfd61bb1b9bbcfd20b5255bbeb626208c46a013f2f08f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains a link farm pointing to various compromised websites. These links likely serve as a lure to trick users into downloading further malicious content. The ClamAV detection of 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4215

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350c68eb7b4---wimadatikirodafofevi.pdf In PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/penolenorokoguwe.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/78567047457.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/mazutulokowunaj.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/nojadimenobamerop.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/80uqli459cpse4abgsk68210r5/93032574501.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/6454112510.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210913034354.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/15330067972.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/4qvb3fv6hacuefv6720u6csg05/venamopawizalas.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/tekolebilarifirujof.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/50955472846.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/23556100988.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/woxata.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mokatisuw.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/lunoxajedazejel.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/51867164959.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e5086a50---dagagukisezefenudisoge.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-22/20210922184919799264.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/lafexagamedupala.pdfIn PDF document text
    • http://lachina.cn/upload/file/61235884751.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/vopimut.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0fbb1739e95a9538f2b7d34145ccc005/9185399693.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/77606916959.pdfIn PDF document text
    • https://www.alliance-educationsexuelle.ch/ck/ckfinder/userfiles/files/84192397384.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/kabuvudonukudurezidado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+lego+city+my+cityPDF link annotation
    • 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_off0000b776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB776 10648 bytes
SHA-256: c2094eea89cf91550aab535ed57321fd57d7b2808700115ff978562c34771f3c
font_01_sfnt_off0000cfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA0 16856 bytes
SHA-256: c92d72f0ab2c00d7bc7df7258e4d0e042917f510a11cbd3fd8390f4dfa91cbe5
font_02_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1