Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2a4bc096296a77…

MALICIOUS

PDF

91.0 KB Created: 2021-07-17 10:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b159683afad6c62170412c19177b420e SHA-1: 4daf9c3909608253b471b49682ac445201400b1c SHA-256: fb2a4bc096296a771d7bac0800ef3dd2c18916bd570f046526ff222b61e90ef5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the nature of the embedded URLs and the detection signature suggest it is likely used to deliver phishing lures or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://asthasupermarket.com/userfiles/file/49494295330.pdf In PDF document text
    • http://x-site.by/upload/editor/files/begelalebuvawugabir.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/76258223417.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2r406m88k9oscennsmet85h18h/muxafuwokes.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/rivinonixufaramudovet.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/43061257585.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/kukusulakebunuleledun.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/85287027187.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/lajuviwodimafezu.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6f49f156f---zomipetegaj.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/bfb3e99ea087d272540f618862520f3c/ruvawa.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/pezexi.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/fntbrkk5fu1s4mmlggnp0ueskc/luzofofiwekujarasozipixov.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0ce4ca964---newijubijixinazexovunubat.pdfIn PDF document text
    • https://roc.mn/uploads/files/73351434033.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2abc5f83a---2609396614.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/25682671490.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a56982dff0---delorewig.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/sirudef.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160765afc42611---muvuzibisutazemalovozezis.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9281031b3---pasokesojemiwira.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/gakitubegexi.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/59e8005e8396b5fc30b72beb4983ebc4/48904245445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=elements+of+rhythm+chapter+2+answersPDF 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_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 10956 bytes
SHA-256: e2a3bbfb959ebf0faca01b55a522ed827700fcf3abe775ccca075dfb21331b6c
font_01_sfnt_off00011ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD8 16924 bytes
SHA-256: 4c25758147e3a9860a74cbd8c100ab56ee3fe372e4ac8eaccf5d4e0446d99e71
font_02_sfnt_off00014691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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