Malicious PDF — malware analysis report

Static analysis result for SHA-256 192430898fa35408…

MALICIOUS

PDF

82.5 KB Created: 2021-08-16 17:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: beba78f320bd03946a15c37851dbbde7 SHA-1: 927cd83c776780b51151331d770c478ca950b505 SHA-256: 192430898fa35408c97f74802c765816cd9a9bf97c3773f42e19b56c0f033321
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a compromised CMS upload link further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://expertsystemgroup.com/file_media/file_image/file/77194967054.pdf In PDF document text
    • http://sloplast.com/userfiles/files/jukogosazi.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/jujutobijudobag.pdfIn PDF document text
    • http://edgecs.net/documents/rexomixijuki.pdfIn PDF document text
    • http://chouchoudauphongongtay.com/upload/ck/files/96077853286.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/13859998681.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210726_6E474596DCAEC145.pdfIn PDF document text
    • https://rajaunited.com/contents//files/fozut.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/39201180672.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/21d4199be0787eaa8633a8bc57bb2cf2/83870967205.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/39197534110.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/61180610139.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/c2256u5mm0qq9qvg7khr2jq173/wuvidedupudilubebifizox.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e5321ad7---90674970669.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/85629966705.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/28785711990.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/lonaparaxoxibozale.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99a8c1615---mojasikonawavudaxudopun.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/73252368297.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/fusobolaba.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+write+a+formal+email+asking+for+informationPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/ledukik.pdfIn PDF document text
    • 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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 16392 bytes
SHA-256: e9c565b95d358074ff37cb294595a14a8c755d0435b1db78b48df4fc62cfed74
font_02_sfnt_off00012251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12251 11080 bytes
SHA-256: 02592a6621d21a45cf154c5022f1f28397e9798ccf7d09993208c11ba12c25e2