Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb2366f3496090b…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 05:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cc148a1cac4f441c3b26fc8faf27f6e5 SHA-1: 3ce3c204c1f9974fdc07d766c832b33eb82bceab SHA-256: efb2366f3496090b15b166d3bf58518fcb67616863566383613de357e4c6847d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm intended to manipulate search engine results or direct users to malicious content. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://blccy.com/userfiles/files/59444794606.pdf In PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/jusijowifotuwagana.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/26171474458.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/xumiles.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/juvuzozupo.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/gufowomebavedataravib.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614a200645280---luvaligupeduzavesax.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131889c6b2d7---53324185189.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/fusuwolulosilukefijiguz.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/vokugiwajokutari.pdfIn PDF document text
    • http://marketingnews.fr/images/file/gilizanusujow.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/fasugi.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/15357941885.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/jonegisefomigibog.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/kolasosukuzugub.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/fisabulenabimivirekigamaw.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/zalilo.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/sabobunoximatifirikike.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/lepopomewanegefenazotegep.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/xumunuzajonokipaw.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/toxenutaj.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368f1b6a7c8---wafesoligapikuzo.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/30370716604.pdfIn PDF document text
    • https://europartner2.pl/uploads/28424863714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fast+and+furious+9+online+watch+full+moviePDF 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_off0000b083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89A 11136 bytes
SHA-256: 7dd990fa35db2aa8d285feae6726b84c7441fc27d87de26089be3c730fde52ff
font_02_sfnt_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 14728 bytes
SHA-256: 6cb3eb6ac1174aa52009dfe903b498e950102978122267abf9b766981523e3a8

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