Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e17dd5eea04b36…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 00:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12224c3ecbbf39200928fba2db419f42 SHA-1: a9deaebb2bae4a7858dbb403bc4307ec96127357 SHA-256: f5e17dd5eea04b36aa5af154b950ef52be208a9fd3b294ed97c3ef9c450db57d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially harmful external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085894db3da3---44949305013.pdf In PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/fumiworemelezugibobi.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f3d69398880cc85c9e18691b7e8303a9/74122068743.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805297eefee---dazilo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609550139cce3---2171514474.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0522a21871f37160375fdae494384d2a/92349948796.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a62ce5881d0de80235203d732e45c7dc/morisuwebogatisati.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/13829815567.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608067417274d---60385747547.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/12355262984.pdfIn PDF document text
    • http://abnicum.com/files/file/nomisokodavamowatemewuwe.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/69310461521.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f5bacd9d4---63839536905.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/simavanekuwam.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/64408365743.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/fupeponilewoga.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/xibinoxawazudafixubegopev.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16113ac61b8694---84279096518.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831ed7d647---vadibofafosuvik.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/tefixibos.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b56d24eb443---7207606473.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/3e6180f772ea7b7f1eedfd42d435b8b9/26623208851.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/pukevezurusilapivipera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=chemistry+human+activity+chemical+reactivity+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_off0000c1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F8 10772 bytes
SHA-256: d5905cf4fec4cd2a7b3064d629956d4f2267fc1dd7b4c04ceba4d5c0dc6cbb21
font_01_sfnt_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 16752 bytes
SHA-256: 97d0246e52a132861df3d5e0feea571a16f38efddc0f6859e928032049a12366
font_02_sfnt_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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