Malicious PDF — malware analysis report

Static analysis result for SHA-256 af03ef889269dfd7…

MALICIOUS

PDF

102.9 KB Created: 2021-07-17 09:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ee5d236b2f42f5f0fe2686637246d42e SHA-1: 24a482b4ea32c6d5da2f70eb9034498f2fd5f74e SHA-256: af03ef889269dfd7c1d4d8b38d4c0924aab6fcfd56758b35d3e2f4ad8a0fb6d1
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, with several pointing to compromised WordPress upload storage, suggesting a phishing or redirection scheme. The presence of many distinct hosts and the use of UTM parameters further support the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://driftwoodcc.com/userfiles/files/lodivuzopulovakoxobik.pdf In PDF document text
    • http://martonaroniskola.net/userfiles/file/rakupogotivurexotim.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/7727113349.pdfIn PDF document text
    • http://cortabellanews.com/userimages/bujegi.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/7ad5acfa227827922e354cc816bcc3ce/povutemipogubonoluxanakab.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/gobejilebokogogiz.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/wilutidaje.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/3460178344.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/83793840172.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202151953248871.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/57405148934.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852253adcd7---63556880376.pdfIn PDF document text
    • http://e-district.org/userfiles/file/6569232813.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e9487a9e500225360b81a775008b74e8/47576242220.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/lcfsv7470765nvhdenthc0gj94/nesakozomo.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/4531700694.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/sulenoposaxagu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086661509c39---88551045851.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160cb77082bea5---babuferabigexodufa.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/femagolororokaj.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/98154ca267ccb236bd312f1c7463ed30/luvapo.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed38482166---13995659454.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/38345431603.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/kimawaxota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=process+barriers+of+communicationPDF 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_off00013181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14998 10692 bytes
SHA-256: 6033bc50291c4ca32b902598bf5f60fb65d6f0044f7bec4952518d720890486d
font_02_sfnt_off00016224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16224 16912 bytes
SHA-256: 9558810eb1d3a233ee2298957c9099d85a71d8a8e2bccef55758150c2d256923