Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5522dff6652fc2…

MALICIOUS

PDF

74.5 KB Created: 2021-08-22 00:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad4299c9d30359b7bf559b2fe2260a39 SHA-1: 86f7003b2a443db780197f9cd08b5992b42193c2 SHA-256: 1c5522dff6652fc287c891e5b1dfc082420f95f6c472d5a215111ba926525d0c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://queure.ru/uplcv?utm_term=cpm+algebra+1+chapter+9+closure+answers PDF link annotation
    • http://sun-tes.ru/files/file/senanubimogoro.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/56229504778.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/96818318029e8907d7ade7a92e437db6/41640955309.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/venikizifemelupil.pdfIn PDF document text
    • http://changdahk.com/upload/17693181753.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad938053761---2006608797.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/56d0c70db6ba4599b6ccd143c63ce18c/vakezapoxufakemekiwo.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/48975681816.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/7197638972.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/nuvufisonewerokagil.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/34551917235.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/01c764438b09dbc9ecf20364c6e3f08b/gogitimofenogogamagan.pdfIn PDF document text
    • http://cpils.com/userfiles/file/ninalu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/389da756fa2f7bade4b1039c8c815a21/sidavesuruzipumemeb.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/penudagezevogewewofu.pdfIn PDF document text
    • http://fruitvita.com/files/files/guvagative.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/fisd0alfa52ogj7mip0dje5ql2/74257729788.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/kuxokefelexofagezuzixaze.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/84d3778040613ff373dc4c923d4a9133/92613611718.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/4ef82f84c47a86c81ef2fccaab5eaf6e/patineben.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608765c0dbc07---45715387.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608839d634710---12172500648.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/586f9c016501dae7deed486dab5dd5cf/30591598970.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/najeregevurowulu.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_off0000bcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF9 11304 bytes
SHA-256: a2697fef5b17133398a978e13716b2a34e0c485d919b2e0728e13c309ec2217d
font_01_sfnt_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 17340 bytes
SHA-256: d28338cfbc124af8235480c0d37542c76af0bffb7d5b850967c268efbdae10e5
font_02_sfnt_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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