Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efc817cb6947f4e…

MALICIOUS

PDF

91.5 KB Created: 2021-09-18 02:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff89e0bb8867d4beb1625b0fcfe90437 SHA-1: 8778e0907d118bc443c4078032ff85c4866a48b2 SHA-256: 7efc817cb6947f4e38409b5ce3e4849e44c0560a34ccb22748ba7a4d7cf55fc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to distribute further malware or conduct phishing attacks. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pixomot.ru/uplcv?utm_term=platinum+action+replay+codes PDF link annotation
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/338f7a7dc37c8ca50e1928aaa90145f5/99390228702.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/gupugixizominolobepezef.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/siwewojolikoxojozudo.pdfIn PDF document text
    • http://irollee.com/userfiles/file/92464444407.pdfIn PDF document text
    • http://sushi-belovo.ru/files/36448645460.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/fumokediviwebo.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/parijoxobugovakuvonigone.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/lixez.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/milebilowipa.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7fba9da00---waxuvadowabatinixowog.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/91995028241.pdfIn PDF document text
    • http://maxbrio.kr/files/files/xedaviwuwefezili.pdfIn PDF document text
    • https://fptica.ru/images/file/detesiri.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/jimimuwaremifoxifajiri.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/2587917222.pdfIn PDF document text
    • http://yoron.net/up/files/xupunijutuwute.pdfIn PDF document text
    • https://tch.lu/files/files/roparikane.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/61349658549.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/42898995297.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/gejagekaf.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab2a9aecd9---nuvavujudubijalavoto.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/69159065584.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7d0cc05ed4fc7af6d6550c6f3f534684/vaxet.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109091357536875.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_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 17424 bytes
SHA-256: 257becbd21264deb736a25dd4f9a762b096c3387f17839561083cf91cf4730e3
font_02_sfnt_off00014770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14770 10892 bytes
SHA-256: 4d05b4cefc39b1f62125cc199bff40bc5fa1ae10747c093cf9ef1a2742f8bfbe

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