Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f75bd39d2550af…

MALICIOUS

PDF

91.3 KB Created: 2021-09-21 11:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2962aa72f61f5319abcf40c5ce53cc7 SHA-1: f298e36c2b86b232b6dcdb4059764510b640f1e7 SHA-256: a0f75bd39d2550afeac92fb1141d327817bafce93d277aec8badb06efce5e682
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=the+classic+slave+narratives+henry+louis+gates+pdf PDF link annotation
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/1048cde0d2ee168014ca0026fdedd462/34894937726.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/74322828227.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/8062375284.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/50093324747.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/6929782396.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/58985164147.pdfIn PDF document text
    • http://scpt.it/userfiles/files/13371895083.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210919214655.pdfIn PDF document text
    • https://samudra99.com/contents/files/lebubokujajabidedabutu.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/78079384165.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/tosixanerokojakurozamaje.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144fb967559f---woxajarutalafikib.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/fozek.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/70616306728.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/suvasuwovususuvabu.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/99478442846.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/venakogelexutulomebova.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/60287925745.pdfIn PDF document text
    • https://elemonbg.com/Files/File/vesaku.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/gibas.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/43476410683.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130f63ec388f---vatopatuvegapesivid.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/lofuletiwogevajamu.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/wimivedefav.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_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 17428 bytes
SHA-256: deff95997c0506790bf9684ecb74f4f464e7d667a0109aacdeb30b69121fd873
font_01_sfnt_off00012d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D20 11140 bytes
SHA-256: 178b7959df4362b82d05f1cf38bbaf981312c03114eabdce0774884bfa7b446d
font_02_sfnt_off000146fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1