Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d3975de666694e…

MALICIOUS

PDF

80.1 KB Created: 2021-08-24 05:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1035e5d8d605bff6be6d4896ea47d78f SHA-1: 32381c36c0d2f98bf7125d33024cb5a8ab55f896 SHA-256: e7d3975de666694e3d4f18d6cee2360ae15351d686edfb98f995e4fce46e9c89
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ba8bbc94e26b14108a639634146b45d6/65068206711.pdf In PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/00f45c913bee75443a78e35e54d8d479/dujivumaw.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/bikejelupubojavasutesu.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/68318346042.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/af47534ca11c4a0754b49c04aeeb94e0/54037220525.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/fefeadcb73f530ff619d5dfae1114be7/pawuvaviwafalejawareb.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082108f7ea2d---12728764479.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/41209856994.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/labowiwepo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/14754869021.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/57594785567.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/8722954945.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/3191726983.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/32471405070.pdfIn PDF document text
    • http://www.asslar.de/downloads/33246652588.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a9734a0042f---defizirujafifujefavuxiwa.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/14485952508.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2050f4b673---87361709187.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210706080945.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/tafadonodora.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/gedugisuvugotovavojupaki.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/4254857260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=guess+my+favoritePDF 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_off0000d35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35A 18060 bytes
SHA-256: c643463fdee2e11af4e03a74e48458fed0b2ff77602a4dc924f997d4864ba8d7
font_01_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 10544 bytes
SHA-256: b405bf8378fd20772c5fcac5863649a2dee4bf680ed0915af876dc6033f12e36

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