Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d5fd9e50385663…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 15:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d7f3eb08d250f14355c67cf8e20be8e SHA-1: 1cf1e28fa1f1cc31001b1d1c92edc85cbfee27fc SHA-256: 04d5fd9e50385663d11c5024ff992ad90f6a2e2fe23990da517411831bfdf78d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=reinstatement+fee+meaning PDF link annotation
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079274f3e999---10163488497.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5sgjkd2ocfk215s5gc52i17mnr/3730480721.pdfIn PDF document text
    • https://olterus.net/contents/files/18615954842.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703fa3c8e44---24544832972.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/106lg3rcv8edb67qrjicuu7k0m/ratesokatedosiviw.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210730/file/56485858657.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/7f8e1981664b55b925b1af33f700c756/52262849566.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/92300966744.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100112b1ae6d---48311582609.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/35784001030.pdfIn PDF document text
    • https://rm-parketi.si/uploads/tijelinevukinojexerugus.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/91797346863.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/dazubuxawizapun.pdfIn PDF document text
    • https://masihpt1.com/contents//files/buboxivuwo.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/29267878253.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a0921e9fc15bafc10f06e399180cc52d/92175302229.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/83131760231.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/17limu5vr8sflbjvqrn6aj5rc7/punukarositikokiwexeni.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///kugoja.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/661452a642338e56e1e8638cf652528e/vosatojebegudizuxavux.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/benanakuditopaf.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/5h3pd9c853fpa0mf7puq7v60s5/vepasukufuvasipatasekafe.pdfIn PDF document text
    • https://service-panev.com/userfiles/gukozurokotirodakasisuv.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_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 17780 bytes
SHA-256: 338a77c3f2218ebcc69f9238242bf5838d5c56775c109702ebbc53387d3c38da
font_02_sfnt_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 10336 bytes
SHA-256: c899d21fee21843fa863bdda671e1e6d1ed174aa695096d4d463f5b6995cb592

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