Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb52f7aa298d09a…

MALICIOUS

PDF

74.2 KB Created: 2021-09-10 09:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c638362f00bd85f17c4a3465b866816d SHA-1: 44eed95e62ac484aae8367ba057dde8d93d70dd4 SHA-256: 9bb52f7aa298d09a519599a2af712b311d4a32032d3ece6fdcf5e2ae3adac179
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=paper+mario+64+rom PDF link annotation
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a927e25526---96102774610.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/gebarutuzodaziganu.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/newubitaromukosopol.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/sotojatugidom.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/12408639668.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/91243394280.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/84625962408.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/jaxalikunatun.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb1e2bdaa0---joseluduwu.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/lagunetusivawutezadufag.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16133988756418---1056513392.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18910391707.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/613390e2204c255d6549f07c6e9e1f42/kamolalapojanuxivip.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/67471433135.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/jexovap.pdfIn PDF document text
    • http://serting.eu/userfiles/files/58133641805.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/viduviwi.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/20847246476.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/26124257101.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/teruzaduxojedobudutaguwul.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/65937689548.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/koditu.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/gifezub.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_off0000bc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8D 10244 bytes
SHA-256: aa4a277d5a48ca2db866d92e559ec48bc52d6c8d4d1939f7027c93dadab9f6e7
font_01_sfnt_off0000d395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 18432 bytes
SHA-256: 4c2f84103df377703e08a01ceb57dd90a0d6c98b6f745ae847e6921d7c853380
font_02_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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