Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d51c2ab388a965e…

MALICIOUS

PDF

93.5 KB Created: 2021-09-17 17:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb4b7dfa94b7f13b263ccaad0f924f6a SHA-1: 5d2133186db12cea9b65a674dc8dfdf0d4f03f24 SHA-256: 1d51c2ab388a965ed92cffae470d77a0b30d59c31282d0d92f54a96d445e5e9b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially compromised or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and link farm nature are indicative of a common phishing or malware distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://abwpetersburg.com/uploads/files/74647855303.pdf In PDF document text
    • http://voijin.com/userfiles/files/paxud.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/bagifuwuzubez.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vezoro.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/pusilekaxo.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/mojivedugimemibesamaruto.pdfIn PDF document text
    • http://sinoorchids.com/image/file/16191785414.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/wedajupulozokajarizunof.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/wodewidegafu.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/bomaziliguwin.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8a260a4c---tirojugimerobo.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/mopegomav.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/89199199226.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/38091707075.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/lokuvinuf.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/3fq53g7iau1m9phce05jhjbevd/95842685266.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/sowizunim.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/7867876076.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/9783711606.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/mapovebesipuxulukadas.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd90fafca4---66196268376.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/nuwoxamap.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/77482072820.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210914/files/20210914152934.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/40291848701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=frankenstein+summary+pdfPDF 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_off00010a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 10776 bytes
SHA-256: ebb05d1ed26130fae0dc31b60fdecb10eff58f4fd97a3969549fc0bbd035416a
font_01_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4D 17580 bytes
SHA-256: 4bbc2b69301fcf3143d3eb14b7419e1f563cbf3c674aa238e4f84dfe7584e6c9

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