Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9e94e752bd6726…

MALICIOUS

PDF

72.6 KB Created: 2021-09-12 09:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d18584a556b2ff03a756f702e3f4994e SHA-1: e90293ee7ee4b7c389c14d81981800d79c293c6a SHA-256: 0f9e94e752bd6726367704fffdf8d75d9735c8ee0bad0a13369aa8dd580a0ee1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document's structure and embedded URLs are consistent with a tactic to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://vinaktv.com/storage/ckfinder/files/79172907287.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e37ab43048856b6fba3fdfd9b53ab965/nonuropuzifi.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/vunigegoluvazox.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132562e3cc67---zedonowojifanumegidufe.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109081111271544.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109031929579993.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/51670058538.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136511fc51f5---zatinoziruwerijeduwuvufaj.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/zokisepizopug.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/rufuf.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/50061717234.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202193122187160.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/34334265060.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/17256610168.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/54579197851.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/53599424128.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/mumuxibukadipuxudemut.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/banibamorisepuvores.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/rolipazipasarozezemofev.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/dilixa.pdfIn PDF document text
    • http://c-amc.com/upload/files/koded.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d94aa0ab15---jobetevemototopavuripef.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/nixabibolak.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/99907870989.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/vulad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=asphalt+nitro+online+gamePDF 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_off0000ba27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA27 16408 bytes
SHA-256: bca73166f77c1486df35b9af2f017aa353c1708d541a1d4b451134759c28c646
font_01_sfnt_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 10680 bytes
SHA-256: e6839bf9ba1de0d2fef426eb87445f96b0454fad12c8503013d9eeb1750964ff
font_02_sfnt_off0000fcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1