Malicious PDF — malware analysis report

Static analysis result for SHA-256 a121e60e8d37e948…

MALICIOUS

PDF

68.1 KB Created: 2021-09-28 19:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f49c2d52b81a516976deea5c07cb9ef SHA-1: ee997227a103081e282cf3b58c190aaec9443355 SHA-256: a121e60e8d37e948469a31c16a278a24ce46a287c5a4483cd339eaa261e3b410
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://abwplazaview.com/uploads/files/42344231971.pdf
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/25507619529.pdf
    • http://cuanhuaabshanquoc.vn/files/57275068223.pdf
    • https://ssekolkata.com/ckfinder/userfiles/files/75222529793.pdf
    • http://hladonural.ru/upload_picture/kukuvafupuj.pdf
    • http://uslugi-ogrodnicze.pl/pliki/File/47758445656.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/02ov9hafsbgel8dej979eitgcp/xeluxuzasino.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d30b530c5a---tixolux.pdf
    • https://aawyx.com/sites/default/imageuser/file/84704630742.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614b17680f2d0---30609504979.pdf
    • https://khonggiansangtao.com/platformecom/img/upload/file/64759736427.pdf
    • http://cnwt.mgo.cool/upfile/files/2021/09/16/razesebasis.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5f7c46a6a---jokefun.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d43357306a---39326062276.pdf
    • http://kengosushionlineorder.com/uploads/files/4991460271.pdf
    • https://dp-engineers.com/admin/userfiles/file/77634951442.pdf
    • https://xtremefitksa.xbodyksa.com/ckfinder/userfiles/files/widabimekidipomogi.pdf
    • https://psfund.org/public/uploads/files/cms_files/wajer.pdf
    • http://vipacademy.org/userfiles/file/mojebeju.pdf
    • https://hinaweb.com/upload/file/xatipopaxewuxoli.pdf
    • http://apartmany.cucoriedka.sk/data/files/nuzugosizifaraz.pdf
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/pasevivozumogafekavaz.pdf
    • http://pengyou-english.com/FileData/ckfinder/files/20210928_A5182CA40247C6F4.pdf
    • https://globaldreamindia.com/webcms/file/49956136451.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=week+7+unblocked
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b034.bin
d15f5ed9a9e64707e8d83d3f9887b2bc2f79cff4763291afba82195ca673b354
pdf-font-stream PDF embedded font (sfnt) at offset 0xB034 10116 bytes
font_01_sfnt_off0000c6f0.bin
e25849e6d6ea89cc3598243472fa38c750f335eea385f48f4c1d3d4295879587
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F0 14480 bytes
font_02_sfnt_off0000eb69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB69 16792 bytes