Malicious PDF — malware analysis report

Static analysis result for SHA-256 37293730a3480d75…

MALICIOUS

PDF

90.9 KB Created: 2021-09-27 04:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5073748b21384bde8e89ec3e5052d05e SHA-1: 401e4a811c6b5db9b33f7a0e61f923a904b1dfc0 SHA-256: 37293730a3480d755c96765ca75073927ab8b9a754642a464c112c27b599516e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI links further supports the attack pattern of directing users away from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://irlanc.ru/uplcv?utm_term=enai+noki+paayum+thota+full+movie+download PDF link annotation
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/88481609007.pdfIn PDF document text
    • http://olympusflights.com/files/files/73476270133.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/xuroridos.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/lowekevotifefemoligufopo.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/janupujixetazigerosoz.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/33314902172.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/pesebotofagaxukovovupexox.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/30323796246.pdfIn PDF document text
    • https://avflash.nl/upload/files/33042192210.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/fuwofusewolukoroxi.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/borererezewajojoxokoguri.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/dasibavifemenuravadigifu.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/fusuzizewalulumo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35b7d1017---76294454417.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130197d94da7---bitadujugo.pdfIn PDF document text
    • https://10fci.org/userfiles/file/59199547369.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615119facf848---jujegaboj.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/176962964.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/roturajij.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021926211272656.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/wutidimuwimowolaresuveli.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/92275101662.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/majewidisala.pdfIn PDF document text
    • https://latework.cz/soubory/mexakogikiwigo.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/furudirutemojufivigejariw.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/38983530478.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/dekojaroru.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_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 23788 bytes
SHA-256: 6825bfa85cd8de5fd1e4343667b8663111cc879714c331b7a048b21fccd30270
font_01_sfnt_off00012c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B0 10936 bytes
SHA-256: ae87cc180d97d51fb8f08e9d018f26ffdf3cb023ec46a59efa6eed5c91f1a6ea

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