Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c742ff06f0964b…

MALICIOUS

PDF

95.9 KB Created: 2021-06-23 22:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f522f649814154bb3477e3ef05d780dc SHA-1: c59a563b6d844c1e5217ee1fea646c185f7e833c SHA-256: 05c742ff06f0964b91039b6d40254f30ccaaa25b8383ee2064792656c8e9f6d6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/uplcv?utm_term=hasta+que+el+dinero+nos+separe+193 PDF link annotation
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbc0898b8c---bilovanonejikemezefuzakik.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b107c076f---20714968024.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/63746452162.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6ibafr32qebpjvuihppf6of5ce/naxogudipe.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7709bd1b2d6c3e3babed8be9bd12a1ff/34524135361.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/xugopodawefasukukixawe.pdfIn PDF document text
    • https://masihpt1.com/contents//files/kelepupej.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7d6e738bb---47995761637.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/fasixevonij.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/a51mn3hd4888vbr64fm7i5hc3h/89729338744.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/77291119131.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210607070629.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfda3c1017---karovi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/rt63vod31v5m7a95mkikvveomi/17348771571.pdfIn PDF document text
    • https://inncredel.com/uploads/manijesiredozebafox.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972c6c0faf5---dufataxelugazuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 5412 bytes
SHA-256: 4eabcf277f12c7a46dd43e428c06cd94e31f5bcc232a9d71f02254ef3fad8325
font_01_sfnt_off000125f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F3 3120 bytes
SHA-256: 2d1c02d7faeb7dad5af5d103f135926a0d4fd4e69f3a7da8959d46cf8e88466d
font_02_sfnt_off00013276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13276 11736 bytes
SHA-256: 42a7aba60bbd23fd285eab96aff9ed4719977470421eb3e5c2770863e15a1479
font_03_sfnt_off000158ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158AB 16860 bytes
SHA-256: 5d429f7480a6ec4bebbc2cf98359e9484e11e42c78c5f7865aaeb138d4f463b6

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