Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21a06efd1e5f951…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 05:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d5ca0358483a372fe8bd39a42b2512c SHA-1: 04654b9683c12801328d311b73c74e4c5f6a7553 SHA-256: a21a06efd1e5f95128b7f789a311690ae617fdd650184a2ce3aefac699e86e85
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, with the file being identified as a phishing trojan.

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 http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/233a6584d02afa7f95d3bba51e86c0ed/selamutaluzepi.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/41ba4cf67abbc8240021c2291b6a8fa1/nagujizalevogaxajepo.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/86f868d5e24efb99b88a0ba76eead13d/lademokoz.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b22d4c33---mojovexokesujugimelule.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943c774f1b2---kedubamezovatebupolire.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/56179831087.pdfIn PDF document text
    • http://df-foundry.net/d/files/11688292203.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/lojajumivuwilowu.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/41091228903.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/zixilubelajewifat.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/nosimezojizunepajixi.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/xepirojizagomeb.pdfIn PDF document text
    • https://alutat.com/data/file/32639741497.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9a46c0a37db7d03b5b0fb379ebce6e84/16772056127.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/76118997991.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/65510408702.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91953412f---gozalojena.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7315ecc5b76fc7b283db3155316b88d7/10401377038.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/52102025259.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/117d47804466a52a40d4de2ec77aa81a/fitiv.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1fa5b705---kiruf.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8551b875b4---nuvafakugizozur.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/xozasanufatudug.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/psfio0ou5mpmf75nbicmfqq620/fapexexidezolejivifobizu.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/44182855795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=final+lien+waiver+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 10236 bytes
SHA-256: 7147a382cf9c7631c26390a162f00b1f0bd792bc18e017131122a0f97ff11cf8
font_01_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 17580 bytes
SHA-256: b881d40c3a0b4091f89fe70713049ea273eab730fab0c76d01aaf91a827a2958
font_02_sfnt_off00012675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1