Malicious PDF — malware analysis report

Static analysis result for SHA-256 beab4c9d5bc93926…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 20:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73b228f559f4b5ac95b258c518696c10 SHA-1: 37a6199df53b77b7744da6d562fbd0866e89dff3 SHA-256: beab4c9d5bc9392678125d1686a3db797cfc2ae1cf3e8b6eb1d7fd6ada90deef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links to external PDFs, many hosted on potentially compromised CMS platforms, supports the classification as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384d8167511---topedapokitizitizumedu.pdf In PDF document text
    • http://pradakshinam.com/fck_uploads/file/74824241180.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/38858970112.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8cf93620ca8abde6a466b8b85b909021/luwutaxujada.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/dusalaterotag.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/95251079376.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/dijezi.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/85197969198.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210902_121241.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7b9ab102b220e5f08d8c26f31c3c21b4/36463662654.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/31511620746.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/giwegikunisabikaga.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/disaruxobuluwupesenavo.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/82048539220.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/mubapipaguw.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/95573740693.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/82884650621.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/21502178552.pdfIn PDF document text
    • http://progetec.org/userfiles/files/vofobetopomafuta.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161351a235a66b---dolazil.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/larivajewosibovatutopi.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/79094599454.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210915_182944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hang+em+high+123moviesPDF 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_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 17988 bytes
SHA-256: 476a2bf659b3299756d25eefaaad5943c5aae1299b5a4de15a7e7630d87cb697
font_01_sfnt_off000112d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEF 10712 bytes
SHA-256: f2d91b80f9f4cc3e19883df8879d724440788502916b7fa8ddc6759e268ee23c