Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92ab2fec5e04a4b…

MALICIOUS

PDF

91.0 KB Created: 2021-09-01 01:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc3bc68fad1cc27fa2ea1eff439be004 SHA-1: 9e2703dc4a09bff6d7536088498b93425429c809 SHA-256: b92ab2fec5e04a4b284b65355f73e9014105e7676f43ed68852c3c62c4f5631f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Harvest Credentials

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or credential harvesting lure. The heuristic 'SE_MFA_LURE' indicates the document is designed to trick users into providing one-time codes or MFA approvals, consistent with stealing session tokens or abusing multi-factor authentication. The numerous embedded URLs point to compromised CMS upload storage, suggesting a distribution mechanism for phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b75082b0372fe2e735ccc3de8f869b53/guxexibabezuraputu.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607887e344337---9616506275.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/23614869928.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/powuvefifoxe.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54d2d2d64---jaxokaw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608436b2efbab---18118944156.pdfIn PDF document text
    • https://olterus.net/contents//files/wopekofikotu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c2c7693cd---63379587030.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/vt6os18nh2bkdhav78o1kmcd9o/vafemuwenedaziwip.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/rrsj19eoqnjn8njj9if0d19gjd/92101263448.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/tesesimenujaja.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/jetipotewezawamunifimu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9db062964a---81600117667.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d439652b69d---jugujun.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098d14edd829---tuvexinejedanimudebegi.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///pavorabelozodupa.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f6c84d8413382bfa39714ef0f5e51c35/pujumoxamukaruxedu.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16124a03479d5a---noxijaxusokumolunoko.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/dizepawimigofitodipiwu.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/2osvffeb3guq56btjjuj174fdq/21602427112.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/70195690407.pdfIn PDF document text
    • http://mosjob.ru/images/file/bemamavepokoponalig.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98743639938.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/milomerawizewuw.pdfIn PDF document text
    • http://canoeing.by/pics/files/23639916505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=an+post+ad+mailerPDF 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_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 10532 bytes
SHA-256: cf64cf8209119d60dea548ea089f7be43bb1daaa8fac184b84b0c5ea37e8253a
font_01_sfnt_off00011aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA5 17136 bytes
SHA-256: 2d0167044441a4ae8e9a67045703a242166dcb7118676f0105b10aee69918ab6
font_02_sfnt_off000146de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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