Malicious PDF — malware analysis report

Static analysis result for SHA-256 52445c8b94acf4cb…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 12:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af56530368cbee03a69336eb512a7aa1 SHA-1: 6e909a7c368fecb3a5932cf1d00d008665d3e87f SHA-256: 52445c8b94acf4cbd2ee0c640788c1e0cd4bcdf73ed6c132ecb2efd6796c4294
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs, many hosted on compromised CMS upload directories or disposable hosting, indicates a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. The document likely functions as a lure to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=strategic+group+map+template+ppt PDF link annotation
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f29600199e8---xulajisuzimaro.pdfIn PDF document text
    • http://0930actress.com/files/files/49753903952.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/tojetikujinizanudedun.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/tufuburelodawodad.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/3bkr3h5prjfg9f78f3isj1anv4/12233312501.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021081610191436.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5e125ac9d---zejotubu.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612a5cf52459b---83885249074.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/puwufa.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/9809516177.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/89802768702.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2015635425fe6719ff0a8d66e3974b86/lojitadimiroxujoli.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/resalino.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/52630106944.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/joxogimafotakilupizab.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/cc7d7a5e5c02f95ab521cc4aa2c1f6ef/kopabopusuvirujem.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab867823a9---44182701108.pdfIn PDF document text
    • https://telenovella-bg.com/files/63772495956.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4df5d0684b792dc96cb8cbba37b21a1d/99883384134.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/f34295c177418305b0ba13a420ed1f85/39647824410.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/luxiwopogivuzusenub.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/51169607854.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_off0000cebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBD 17096 bytes
SHA-256: aef7ce11df69dc998fe75a3b0294a3ba088ac2d25dbcb86c8b22bbc8663a2842
font_01_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 10620 bytes
SHA-256: 3719ef1f2a9fec34360bd855c86fd20b0eba363d6709def9ff7cd8b5331fbd89
font_02_sfnt_off00011362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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