Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd21b00ebecf525…

MALICIOUS

PDF

95.3 KB Created: 2021-09-04 10:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c094986f2b940cac2bc719e717310c0 SHA-1: e633d222bd24b8ed321499a9d2d0121bef533c3f SHA-256: abd21b00ebecf525d879584d32c6672c989005a1a8c4445110170bbeb769aa50
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites or disposable hosting, likely intended to redirect users to malicious content or for SEO manipulation. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://allytemp.ru/uplcv?utm_term=oxford+modern+english+grammar+bas+aarts+pdf+free+download PDF link annotation
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/87233282492.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/41275952403.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/50637012034.pdfIn PDF document text
    • http://feg.vn/uploads/files/74022563416.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16085b6ad24565---dafebatusujoxexanupuf.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a16d03672af---xomelibenudirajiwapadomo.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/67284436489.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/63170ddd018facdf8895be3981824230/75483364920.pdfIn PDF document text
    • http://z500.si/files/42713371456.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/defawabasopofimiripotolun.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/98720743549.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/44180206076.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36aea5d0df---runowopifetogezogigipu.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/8229769014.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/83787566706.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/bonomopefigola.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160978e0cbc5f2---gonufodu.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/90267503940.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/jabetoz.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/riwinovapezag.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3aae78740---29106533757.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/bef2b80eadea249ab8d83d60c68bbdf8/tifenuletebonula.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/1523861741.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_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 19080 bytes
SHA-256: d0f3774097d406c68fd2bc083aeee1c75fc881fee49f3474fdab4c7d5d77c6f0
font_01_sfnt_off00013cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBB 11296 bytes
SHA-256: 2148aeb606f5154739e2e904d51a063eda659a71fb1169944d77738809525156
font_02_sfnt_off000156b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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