Malicious PDF — malware analysis report

Static analysis result for SHA-256 204c1a5fdb9d7b78…

MALICIOUS

PDF

72.3 KB Created: 2021-09-07 07:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7df38f78b3ebd29fdb2b2b3c0c03ead2 SHA-1: 4a15d88bdbc26a5a6a75c4d7b47db25402452c30 SHA-256: 204c1a5fdb9d7b782e20ada6264d9b5e49c1e8e813b88f62899b4da954fc3b97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. Several heuristics indicate the presence of link farms and compromised upload storage, suggesting an attempt to host or distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ikitellirezistans.com/upload/files/zadanuzuniwisibupamip.pdf In PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c2494fb043e3bda897d2b5ab82c82080/36944280036.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/wuwizekixo.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ldvvbmbiuaam8sikv9q8irq1i8/nowoxutof.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/koferedojov.pdfIn PDF document text
    • http://sakem.org/userfiles/files/6019215805.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/xebajufiregesejulaz.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a716c57a9fa---9246085156.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/bukulonowosirafuwepokam.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/74332304323.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/68815067804.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/135140c6c1d8a91feea0fdaec430ccbe/pukosuwadikuf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f5613bd21---lubegiwozasinorivuso.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/zodatiburademinakunux.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/32462235520.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/pasedusemi.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/19020219439.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/sixiwepodekukon.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/43547878773.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dd3392e42---62442032058.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/ffec8a019a0dbc02e4e24bf2914be220/widejidepew.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608679131d640---fuvigovowokefipodokekiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=isolation+of+microbes+from+soil+pdfPDF 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_off0000b79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79D 16708 bytes
SHA-256: b221c56807a6a50df87eb5eb9d889447a06a8f31927c4cb88b58202b744743fa
font_01_sfnt_off0000e280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE280 10872 bytes
SHA-256: b0e7c5eec69055caddaf04027eb6df6e2fd28503a7932346cc885eb3f6c67f69
font_02_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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