Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f98efb85cd4b03…

MALICIOUS

PDF

75.4 KB Created: 2021-09-16 23:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 108d3b1d3373ddafa660162ae42d2f48 SHA-1: e1f9b387c52db958f3d36799fbd1df5c29152b3c SHA-256: b5f98efb85cd4b0306acaef5e0962327b7876e595ee062d0d6cad336872d12f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=legendary+heroes+moba PDF link annotation
    • https://agriplan-rs.com/dados/ckfinder/files/gesefixero.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/2843946721.pdfIn PDF document text
    • http://balalajka.nu/media/lopunirezexebutebajikuz.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/62379082003.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/54389666397.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7o12jb9i3a50k3buah4lmbcgc5/12299469705.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27591754218.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/logokuzawexupigedebumazuv.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/jopisavinebikolifisofotur.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/xakewavovamunad.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/351d473becd0fea9b048acc8296321f0/63914518545.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/54326433518.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20219222187.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/masuzexoxixedudopavi.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/40906510025.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a90416ceade4008565dd75868eaf2d3a/rejajofar.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f70aa291a---10772271206.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/92503990256.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/84397273103.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e5af295ee---texumix.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/95519555211.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/nowuzopudi.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210913201655.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_off0000c3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A3 17356 bytes
SHA-256: 06337c783543b9e9a32b211b5b3c9588cda7c5def4ec5fe10ff72b78626d45fe
font_01_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 10668 bytes
SHA-256: 363faea573cc70edebe980bc009b12040c0b0ddee2e11e028b1d0dfd17d19bed

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