Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d4e1a2d3b0b582…

MALICIOUS

PDF

90.2 KB Created: 2021-07-13 16:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 58efd7c51ec9b9f7643bffad1f11341d SHA-1: 8e5a3f45197b377ca9f9d82ec9a56ba578e17e60 SHA-256: a0d4e1a2d3b0b5826b43eb9b146dc47b06821f31a70d8b4de1868ee860390589
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS upload storage, suggesting a tactic to host malicious files or redirect users. The presence of these link farms and the overall detection by security tools strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://teplospectr.ru/images/files/54571150016.pdf In PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160e087ad303a1---lujasubexudawegariguxok.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ade6247b825---55373395866.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/n1tvdd301nih572157tvbnj9cf/vuripatanuresutefepitu.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/jibukaruzibufamawofuxusaw.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/83271602944.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/62457851878.pdfIn PDF document text
    • http://planetamama.ru/files/file/zerajutomo.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc3e4b0567---xudapamoxav.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052722441088.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/jp3j2id7k8vcbf5uen5o8uap74/67677449401.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/gukumitam.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6a45d3504c3d09978a309d739e3fb535/zafirurorojizekog.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/imu1mbr66cu6av27esglojsqeg/18341031921.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d7a1caa760b878b68d83f9fd19cb7bad/20317676478.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/woxorozede.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7499d12a04399ae60e28d51bcb9fe669/31094918680.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081d4119255e---tujivadowabekunufofufava.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/kugonilofigefotapafumab.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/44288936039.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/45668575745.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/fe5426dacadf192ad6e50c01179ef9ab/14192431150.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/60860550273.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19ac56556---99333829383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=jerry%27s+fish+housePDF 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_off0000feb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 17500 bytes
SHA-256: 4fd8fab357546eb9190ee317d8cecd1d1f052009521462eb921900e5363b05e5
font_01_sfnt_off00012c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A7 10140 bytes
SHA-256: f0dcbf206d636a75ac66cecec71184fde43e448d8b5b62899872b56930ebdaca

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