Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17257bfa8ec7215…

MALICIOUS

PDF

68.8 KB Created: 2021-10-02 19:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 914c2d1f9fe5e034d65501aa7a5c41de SHA-1: 34850900fd7845b2c7a78ba437b00a07ef9a2142 SHA-256: a17257bfa8ec721575ab7df4f7224a77cfa20c47c7b2493f57572440d164dd09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://msiutilities.biz/documents/diroju.pdf In PDF document text
    • http://rjbmachinery.com/d/files/91874489907.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/63042540806.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614189d7e4ad9---jodemukat.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/jewatozebuluritubafadi.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4c5e24ef8b3197a556080cf1f06bee2a/90704326612.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/dalikaxumuledibovog.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/63962065077.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/jikowumewifu.pdfIn PDF document text
    • https://dalba.net/other_files/File/bufurepikowaluji.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/d303ed53e6f14b80c7e06a4c27bff178.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/dumozojepegu.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/48459942991.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615416b2c0fc8---34852948746.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156c3f6de99a---78304507918.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0b81792cb6ca8cfa7e4c535496dcf73e/kujojizibuwadadafo.pdfIn PDF document text
    • http://bresky.cz/res/file/679467252.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f55edee3f0---futizokutalijivozimano.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/90971832245.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/ferivosovosazaxo.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/mimasubaxukujoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=solve+equation+in+one+variablePDF 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_off0000add5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EC 10460 bytes
SHA-256: 74808b232adb1dd99cd971c8b4505fc2e4428832ded4ecfe7be342270e6e8137
font_02_sfnt_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 15968 bytes
SHA-256: e81f3cc1858d248cf1717ca5a66d87ca968684d6fa02a836f195f92fc3b68f17

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