Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05c4c0612ffe878…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 03:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7249e88d250f0099bfdc2af243e57b28 SHA-1: 68e49de916923b52015c5ceb42d390847f84aad4 SHA-256: b05c4c0612ffe878bf1030472c7563a222e1cfe225a5072d50e0db309fd25e2c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body is heavily obfuscated, but the heuristics and URL analysis reveal a pattern of directing users to potentially malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2f1706761c4507ffb9d13ee513ae41d5/97396415838.pdf In PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/6be415440117ec0860fff4ff0440caf9/87235103507.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/cpfhfkroatku9uaarglvt2fgd0/kuwuberarevurimosaxijodol.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/kigugogibuvupenojesud.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094435caebef---5474878263.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/g0vo1m2iv10ktvt4iqru1grdgn/gejerupiferajiseluv.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160753ad4e3ff1---batumigu.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/72e39b5959c8b8a7db1240e33d5f7acc/demoropuga.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608102256de83---41781253151.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608db792108a1---zopinigujagamoluzozaxuxed.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3448adafe4---36746241181.pdfIn PDF document text
    • http://isgsrl.it/images/file/duwukumisiwer.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/93693172661.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/vagosifoxonomuxe.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ddf689683be95a795636962cab1bcfc0/44717431241.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/gatufoxunuvirexededaxoj.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/18284842208.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d5b51b5c0d52e8a2fe912e62e02a78c3/nixedot.pdfIn PDF document text
    • http://learningkey.org/userfiles/76816736236.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9bf20e007939d5e47c316a329a84778b/bekadalad.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/nglqp5uu51bm7pg00t34vl0093/lizabixewuvitagizakexo.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/lujeruxakalagirokifu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160850e2bacd9f---dakasuxanifojeruserad.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060809195754.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/79707350805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=a+microscope+the+image+of+a+specimenPDF 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_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 10860 bytes
SHA-256: c95c54630229b5d671d14fcc12d608d76af6954cfb85b608abbb09ffceb51d93
font_01_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 16648 bytes
SHA-256: aa9648f098a5f7c4f574583a368e2d088b8a206f6843fa6e970799238af0cd13
font_02_sfnt_off00013107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1