Malicious PDF — malware analysis report

Static analysis result for SHA-256 da899a71a3a833e3…

MALICIOUS

PDF

91.8 KB Created: 2021-08-11 09:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9499574345268a126e451010df79a0c1 SHA-1: 09ab1bc263998dfebb033b8211a42b1d13fc84e1 SHA-256: da899a71a3a833e387dff497854861c5aeabf2d33586a6166e25c7242c47fe7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to direct users to download sites, masquerading as printer driver downloads. Several URLs point to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d4ed97fa1fb9564a6a7828f228b374e2/mekodogu.pdf In PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/13534247194.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/kujan.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7b18b38238d22a862c2672528169924c/76944085451.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a53608b460---53395210152.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/69690361842.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a15e78038bc---38485893635.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/vogufavuxemubutomi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc81bc68f03---zizenavebifizusigixe.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/lelevafirob.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/tukigapotofu.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/xibobozutejebobut.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/45856207487.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16102ebcca3c1a---motul.pdfIn PDF document text
    • https://hagepoorter.be/files/files/kawilejixikejogiwabo.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/93251344704.pdfIn PDF document text
    • http://maxbrio.kr/files/files/wezuretanuxu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0115084ac4c88cec65d9cd0c43c7602c/fojimixawopikexivusifi.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/47f18e3e8cc4cc0012d58db93d5eec12/52168460515.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/fusomupatagozura.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/divun.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/16102850303.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/93520606029.pdfIn PDF document text
    • http://ymmicro.com/files/files/tixubemik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=free+download+driver+printer+canon+imageclass+mf3010PDF 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_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001192b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192B 11436 bytes
SHA-256: c3d9e61242f23898f15b40b1e0732d2d38468fef4269ff378140420d91fe39ed
font_02_sfnt_off0001340a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 16768 bytes
SHA-256: 301308b55094d1c4b9ffdb00ca0bf7b93acb50e94241d9b33750c03f70b618fd