Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f0cd6e353f0d13…

MALICIOUS

PDF

91.7 KB Created: 2021-09-04 15:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58aa53ad9dcaaf96f07d0a56c6ff3460 SHA-1: 6b8ba5ef67ea4d459d73d6b1ce1c21dbd3372d9f SHA-256: 57f0cd6e353f0d13e41a0907d19d5747c518a7a0e3fb5f2453304616a69726f7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classification and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://artospace.com/pics/file/44780617015.pdf In PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/fppsrbackkk1bgrfi2nbvb5qqb/8371864691.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf22cbea1c---kenitafoxotejobe.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/85472e76cdf0cebc0e86c524860ab2b3/20968617167.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/de7b97bce5ae0ecc0f3770efa3570769/kumepizomiw.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/37037072909.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/kejupopapotewowivagamode.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/03efbf2762ddc018877c96c2a2fc94b1/zababasubobekolupir.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/l1r1etrarm89t1arrh2qe7ltjv/63117467984.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/mofowunelobuwifedonuz.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec1cd1e22e---lewovamuzisuzajodaxowased.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1626240035.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/juwawomubusi.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/sisunatoguzozizi.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/817ab521d1569d8b8fdff70dbd45a394/xaxadexaluredamiw.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/59583413642.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/37484842845.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/54683340048.pdfIn PDF document text
    • http://wirheiraten.de/images/file/33028931128.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/42647091314.pdfIn PDF document text
    • https://keongracun.org/contents//files/zogiwanidatowi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070317e3e662---10175198688.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/a3a2e474a6de2d6ab53f58aa8a63b43e/bopuramovovuxole.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/nibujidogefubisunapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=keynote+intermediate+students+book+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000146a9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x146A9 17252 bytes
SHA-256: 8117c3cc8abe3262eddde4a1ab76596a803d8943d83a6f4e8baf5b4df79d3b91
font_00_sfnt_off0000cba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 26472 bytes
SHA-256: 74bc007289eef53656579f341a61913c6969cd4586f9f33e8c84052d206e87d2
font_02_sfnt_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 11048 bytes
SHA-256: f1487676b538c107602f23c4317e7116ee5dc15be07211282cccd2fe79baf7b9
font_03_sfnt_off00013e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E24 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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