Malicious PDF — malware analysis report

Static analysis result for SHA-256 5396c7a17cb4218b…

MALICIOUS

PDF

75.9 KB Created: 2021-07-02 03:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4b56505acf37064dd457a4352b264a46 SHA-1: f9e49a14c745ee6bfec922101f30f625ef62764b SHA-256: 5396c7a17cb4218b1ab927821016ec75606f5491b5866da2aff587a9a0a73c93
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of numerous external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/effe5455dbddd0ce02c3ec8a5e4ec066/sokipasuga.pdf In PDF document text
    • https://bataretak.com/img/files/file/4965963725.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dbc65367f---48794999668.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/11111199346.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/50576578715.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0afe26a09b0d6ed7725099e7980d8874/29280552306.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/xejeponu.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608191e71bc2e---sataza.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607750a3948bd---79171404054.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/6q47kpipcugqmmpo3g94t5alb6/46600770108.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/490bef158646d19b723544f6d40ba3aa/11923989871.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a9923c529---vuxulirofetifuxagome.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/91467267738.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/27830417324.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/e91cdc2613020700b580a7c9091d6ba5/64378585362.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608eacbe4635f---43397109164.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/fiwetupesorativap.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071a792e1cf5---duzekudujevusuduni.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/98q2lpqog6cmndssqvjhfitso6/bowazezusisaviwa.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/q5dp5q1sl1cj9a6fnv8h14b6ce/92388369041.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adfbca0bc0---jebejife.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607eea63c0fb4---nuvenemufaderasojofuza.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/fb06371e064adcb976c21d4929d02758/16103792223.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/simebadufojo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4483677e1d---34842876791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=4+inch+convert+to+mmPDF 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_off0000c988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 16348 bytes
SHA-256: ab730eed4c4c7da63450717e94b1b47351e1aa335b32e9f9709c15cdefcc610f
font_02_sfnt_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 10164 bytes
SHA-256: 6131e0acff0be315988e645994808ef1d0ae5fb90b824e0326ee2b10db37e770