Malicious PDF — malware analysis report

Static analysis result for SHA-256 8694a71c100c9775…

MALICIOUS

PDF

90.8 KB Created: 2021-10-10 14:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 7b03e72b2abb19f24d28ddb3cea0977e SHA-1: 9374dbf29d0e3549ce2c6d35e93837289415e6f0 SHA-256: 8694a71c100c9775a68ecca289546fa5fa9223e89a505ffe721ab2586fd5d322
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of numerous unknown URLs supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kingkady.com/uploadfile/files/rulolabufemopuzelixobevun.pdf In PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/limaragux.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/tuselebijafo.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/13157420106.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd56d73430---viwenuv.pdfIn PDF document text
    • http://runhouchem.com/upload/files/10931826084.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/dijilimosowazimewako.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/nonuxudixum.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/14215236923.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/45559612385.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210909201042.pdfIn PDF document text
    • http://albergocavour.com/userfiles/files/49690513584.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614922b0070f9---6661770019.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/rewavijujusigabukoliz.pdfIn PDF document text
    • http://huarong-bio.com/upload/files/39801037938.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161340ed52c676---13111093029.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/jazaxosamo.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/tixedatidasil.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/zufidemujagoxasi.pdfIn PDF document text
    • http://klpa.net/userData/board/file/42262010698.pdfIn PDF document text
    • https://redfortfireworks.com/ckfinder/userfiles/files/83385510393.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16152cd41be098---webovewoma.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/43581746558.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/mewigun.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f0458752f3---26601718462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=science+10th+class+solutionPDF link annotation
    • 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_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 10576 bytes
SHA-256: f9c5d08e1d188ed9b63f76d1f71361b0afc98f45508d11d61db7b0164c8c159f
font_01_sfnt_off000113ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 19544 bytes
SHA-256: 2d29efa951275354933ad04a539ac4a948d6d2741f5a3d11a60d0b966355d662
font_02_sfnt_off0001452c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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