Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a004eb082800300…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 01:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f0ce29cd2ecfd88f2dde76ad6af04245 SHA-1: b7a016d78bf9ac028e8856a157d9fa89d225785a SHA-256: 5a004eb0828003005f1e10e1b58422fb01ed0b77ce944a02cd6d9e087e4ee35a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laborke.ru/uplcv?utm_term=what+type+of+food+do+penguins+eat PDF link annotation
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/pu8g7c55duahrjblm844l75n68/52150303890.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/20207722643.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/sopijoneletesojalidi.pdfIn PDF document text
    • http://allycatering.com/userfiles/33934758562.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0880906e15---11428661790.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad602bed5d2---66167987140.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08463cf6f---zuwazel.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/9599b1eeabe885e19270b5ea0460ad82/21927594114.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/finamopafoweb.pdfIn PDF document text
    • http://ligneus.hu/upload/file/nekezexobadesekibovumaw.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/wikirerepivubugiza.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/dc46a7830b2ab53c31430802b8817716/robejevakekutinepeta.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/weputaxebapuju.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13540c706---95175629265.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/mufovajafiwowiv.pdfIn PDF document text
    • https://unosms.us/userfiles/file/34171121885.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/dajabadowafadigeto.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/14656738114.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/silafaraxobigegobero.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/41a7f6bbb534fe7be48d8facc567e514/jitowipodukagojexizi.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/56515996771.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2192a8d11f4ee833018a6994c583a843/sinuwajugazimilesirevorul.pdfIn PDF document text
    • https://nada70.org/userfiles/file/58651770489.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210603_79F7BA719F6F093F.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_off0000c21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21E 10836 bytes
SHA-256: c94b71c261ca7c3a33c0d8d235ae0a5d2a738db205669c8db3d98e8a68d625ac
font_01_sfnt_off0000daeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 16280 bytes
SHA-256: a5ebbc25a8bb065476b84bc4a065c5bbcd8b7e45b04202c5b43cc522031438fd
font_02_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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