Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ecee4a9bdf9132…

MALICIOUS

PDF

75.1 KB Created: 2021-09-26 06:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6971e2767d4fa6da2e7c59835316859 SHA-1: eee470812bc31520f5856a275d0cdaa93e4b2cd7 SHA-256: 21ecee4a9bdf9132161a92caeed1b467064281f7336068b0a3a051c3472d5ca5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or redirection mechanism. One URL specifically mentions "roblox gift card generator no survey", indicating a potential lure for phishing or scamming users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382605921ad---degebaborewopiwuvut.pdf In PDF document text
    • https://searchkar.com/ci/userfiles/files/55908314613.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/28997469913.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/matipama.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/32235165119.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/tajitejosofupitevesaxaxiz.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/tepogaguxaka.pdfIn PDF document text
    • https://zzwgjx.com/d/files/lujomokepelidomijekix.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/14208478283.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/lupenog.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/47968515927.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/tiwugozurapebetakuko.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/tufusetenujesujimazolepu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/de4169fcc24a0262415f039345a1c4be/83724957216.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/xudupibigeketew.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109061443194271.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/muwonekuvoxexanoraxiwero.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f947a8844e67a93dac2f49f9f16609e5/dowipebib.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/xuvaxipodedawukejubi.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/lugirutagoko.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/32982950577.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/29864192616.pdfIn PDF document text
    • http://www.centralperdana.com/file/xadilejonazefaxenepajag.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/49940676367.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd1e291f00---jamuwexozimi.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///xuriwizejafu.pdfIn PDF document text
    • https://stormester.no/files/file/6222120002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=roblox+gift+card+generator+no+surveyPDF 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_off0000bdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD1 11216 bytes
SHA-256: e01f8d130994aead34f30ad09e5740060441c13b1410a488caaa5f71efbea9a7
font_01_sfnt_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 17732 bytes
SHA-256: cf3fb53e90c3d20fa9c841869383be419f0443d62138a78d63890bdbf9643749
font_02_sfnt_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1