Malicious PDF — malware analysis report

Static analysis result for SHA-256 919104f29c920c02…

MALICIOUS

PDF

93.3 KB Created: 2021-07-07 22:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e31fc00090341119f55265698f35b0ce SHA-1: 38c015e237bb85ad157afac522a0edd98dd60679 SHA-256: 919104f29c920c02fb47b6f57ab95f047fa0f86bf4273e89110d883da34912e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple link farms suggests an attempt to obscure the final malicious destination or to distribute payloads through various compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/2d1d6ad70b73aa6a17f4aa880e341c77/bokunadev.pdf In PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/87camhh7f5a4ss2i47jck53e9j/83941239322.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/16a60bada0d02a5902ca3e5332d5f928/jiwosugokututux.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ab245c1b8881de3b1b0fccadf667672c/papubezukimi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e17cf0fa---lapelimogebusupopokagul.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/muburapavomiwakex.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/polikeb.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/sewagitalewasora.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d1496610---gakefur.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/19735094572.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2cdb5d05---xanoporebolepanujanugigi.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/97204922629.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609882aa07489---6470474451.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/7455291364a6885b19cf1630d6d53e61/nutuzinipofila.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a705b26f8d47628eef618d9949476b9b/wotegobeviri.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/88343381969.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/47962945390.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d06e3ea7d---xexesofafozan.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074c9a11755c---jonudimex.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ff4b623a---wirojepokixuzosunemanev.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/24614542924.pdfIn PDF document text
    • http://geose.ru/userfiles/file/55629731254.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ddcf0c06fe3757a71b7bf099bf06a15/bafozexerotowewewawa.pdfIn PDF document text
    • https://ptogel2.com/contents//files/1512471615.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5cb1176fa---neledosijobasep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=blood+in+blood+out+tree+locationPDF 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_off00010915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 10488 bytes
SHA-256: 4b7a3c827b88c6100afc654b72366f1a39d1dc4b762759b48ea903054278c483
font_01_sfnt_off00012105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12105 17748 bytes
SHA-256: 66c41872f47973351e9fe210fd4ab6cc1276486ad7ecaa4486c6334ea921f836
font_02_sfnt_off00014f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1