Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e78b07b483301dd…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 02:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 655877c0e31d586c193a8feb6aef5e73 SHA-1: 318f2cb914b8dd62e45b8977fcc7b3a4a3b4c8cc SHA-256: 7e78b07b483301dd54ff8661de6aacb1e08d2fd360a2e5601113412521bddf79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Multiple heuristics point to the document being a link farm, with many URLs hosted on disposable or compromised domains, suggesting it's used to distribute further malicious content or phish for information. The presence of external URIs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a workflow designed to trick the user into downloading or accessing malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=9+songs+full+movie+watch+online+free+viooz PDF link annotation
    • http://sicompk.com/survey/userfiles/files/juworeziral.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/90968270140.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/5tvoqevel50cfm62e91294i61k1h7mlb/golisa.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/toteduwo.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/lubebolubiwuvuvokuvabopaj.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/29295325598.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d48b27b6b3---53713945082.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/tojebibafonivop.pdfIn PDF document text
    • https://ocw.tw/uploads/files/15329435336.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/36032324896.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/22388298172.pdfIn PDF document text
    • http://maksimetall.ru/files/kofexalarunekunabalid.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/37478731146.pdfIn PDF document text
    • http://africareview.in/userfiles/file/9091531917.pdfIn PDF document text
    • http://tecksco.com/upload/files/xuxeni.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267451613f---rumixikesetewijusej.pdfIn PDF document text
    • http://cartopack.be/Images/file/zikigof.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137f3343c605---53111778398.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132b5d7a0fe2---mojogikovunugukuf.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/42077741506.pdfIn PDF document text
    • https://suruburi.net/mm/file/minopokutetowamumerosod.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/36192353580.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-4/20210904190210842675.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/dixenukupizotulegezeti.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_off0000d74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 18184 bytes
SHA-256: e21f362883bafe105bf4168e8de15fae6d1a44d1be3df712601c343852ad51f2
font_01_sfnt_off00010673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 11164 bytes
SHA-256: b5ec1411491763a5a1e1e0d83738f55a67a518593118a3de4edea94e0c8221f8
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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