Malicious PDF — malware analysis report

Static analysis result for SHA-256 28950ea11aa9b094…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 14:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 00016d9e53dd3a795277be712a22c503 SHA-1: 7b6819c5b431473ff260b79cd097d3624760b2de SHA-256: 28950ea11aa9b0948314158ce1b5db5bef490448cef7e4fcd4e8a9959f471a57
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of multiple compromised upload links suggests an attempt to disguise malicious content as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/15555481699.pdf In PDF document text
    • http://myucmas.com/userfiles/file/54806002344.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f3f4a6872---bexevobujozevijula.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f976cd6aef---katigufurelotopazaluvoru.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbd2b77d77---xafasozinomizajenogarapa.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5dc4da70771e7f7a0c4cef5a394515e0/50971506143.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/6821234922.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a6d0f103---9524332059.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/juzefiralizijaxoga.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/riromawaj.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b24ea11319---wopemizogowibolevalurobu.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/74738912930.pdfIn PDF document text
    • http://besteva.com/upload/files/varezipof.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc976b145fb---16729961732.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/litewasoronoduwoji.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/3211899851.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612116ea82203---99938192987.pdfIn PDF document text
    • http://firegallery.ru/img/upload/nitupajipafalugide.pdfIn PDF document text
    • http://newworldss.com/uploads/file/73189609513.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086b5b8bb899---bosawogakuxak.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/88946411822.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112dd1665b35---repivipuzuwodosinaz.pdfIn PDF document text
    • http://balone.net/_upload/file///boragokufinova.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fad08e283c---risixusa.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/59484843346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=menggambar+teknik+listrik+pdfPDF 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_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 16492 bytes
SHA-256: a6e9c6f3f062e2ea5535a17576b63c0b99314428c415cf7f214b5d0cadf5fc8f
font_01_sfnt_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12270 10948 bytes
SHA-256: f2d2ba6b0cfe9ac8ecbf069c4fe6c061ef1b407e69118a7d0c602b577bb8ea48