Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ad6c829855ac46…

MALICIOUS

PDF

114.6 KB Created: 2021-06-28 04:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8491aaa8be03d140e2c0c0c2827f84a SHA-1: 0358adaabf1121a7f9b2c0dd839edcd51aa63e75 SHA-256: 95ad6c829855ac46027dc72b8e385ac2dbcdcca20d76ea8f631d7d8f78e0e6ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a017886fd53---24577277662.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/7e9107595ead1846da47f696a88ee1d6/wezovuxu.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160796fd5ad49b---34006222026.pdf
    • http://thepokewave.com/uploads/files/68975089289.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2abf7a3beadd375fb8a82b8573400f1a/33407044438.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/99e752817ff2a7d4f2f0dd42612046a3/29631322622.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c33ddeafa2---48077913510.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/72ec44a34650afca67b0c5daa6e9fe91/jopijilabaxapaze.pdf
    • https://emotionalgift.com/ckfinder/userfiles/files/73537523758.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e0a44343669cebf96045ad10ce4b1208/nanimegodinazimopi.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c899fa018e9---gupefujofax.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088583a84419---44742687681.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/53900209396.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/65eb518de25999c785c1eb12e10215b1/xinejepira.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b8edd92195a7695c20aa862130439114/pewudavoginetipafa.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d359ff620a7f1c2fedec174a1984061b/29612468743.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3165b08f40a37fea92644a8658363dd9/derufe.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1260167cc6---95247849064.pdf
    • http://voszveszprem.hu/_user/file/kafojaxilolakene.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9bcc5b3bd---94845748624.pdf
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/4cc8dea48b017549013099b140586a02/3571421602.pdf
    • https://dadesigning.com/daduserfiles/files/fatuxamileresolesu.pdf
    • http://hjtech.org/admin/upfile/file/jajaboluziwu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+definition+for+empathy
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/fdcf684cc1fb076d92943ce490ab6315/9644151849.pdf
    • http://bit.ly/J6fK91
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015bc5.bin
127df925aa436b4d72bc73cb79c68cf99105b14ca23b23c50a5055e20407896c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC5 10628 bytes
font_01_sfnt_off000173e1.bin
32ee20a1068ce489f8d137a038f23aa976734e680793e82479e2e7f64241a723
pdf-font-stream PDF embedded font (sfnt) at offset 0x173E1 18996 bytes
font_02_sfnt_off0001a574.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A574 16792 bytes