Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1358af9e770dcc8…

MALICIOUS

PDF

85.3 KB Created: 2021-09-10 03:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1ddeb5f8e675ea2c33a0cad06b7fa90 SHA-1: 26fb1e625d8ee8a28effb3e9e9f7e83a7fb1eed0 SHA-256: c1358af9e770dcc86e7a87a52642d34638fe4b4ac96b25bfc0f63302db29347f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://paklya.su/design/img/upload/file/risarafakokinodajexixuk.pdf In PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/popegogik.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/dexuvelu.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/julodapojaginagojot.pdfIn PDF document text
    • http://brenderup.ro/mm/file/dowixozib.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/56369480397.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/12729265377.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630781319.pdfIn PDF document text
    • http://cl-pub.com/files/files/62790361749.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/b88enqds47kuk03h9toujjhv6g/pilupukunomiliduf.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/jtndkpg4361u7plr274dm9eqrf/49419074486.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4e1694e3ed85f40d337cec26d8646889/27770512440.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/67072588281.pdfIn PDF document text
    • http://all-premium.com/user_file/files/14967468299.pdfIn PDF document text
    • https://emenu.hu/editor_up/12196378066.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307f0f105e3---damobileba.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/lejeguzovezixelenotazof.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/49714050235.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/tekun.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/nenotawivunewefugor.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/80198518745.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/85476284789.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/39721411024.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/naroxodututef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+draw+a+humanPDF 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_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 10252 bytes
SHA-256: 789b638eb0ffe0e6be6b38b74a8bcebde77e5a1e641c4ec88272a51a95692e53
font_01_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 17312 bytes
SHA-256: 0c0769ca3ee1595f7217d32dd39ed3f6e83827db72b32b34075725b49e959eb1

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