Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0169f473dc0212f…

MALICIOUS

PDF

88.5 KB Created: 2021-09-06 16:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eee24f043b016a5fe7fa1f9883b6e61b SHA-1: 5ccce1018fd925229d9a141b11808c272be6c064 SHA-256: c0169f473dc0212f797a645ee915004f1d0a7c0719b551a78e28c12e0e7250dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://alshaabcoop.com/userfiles/file/9783723319.pdf
    • http://legalinet.eu/userfiles/files/tejazaboxarozafepap.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d90e89d0b---48206609033.pdf
    • http://artepcb.com/upload/files/mototovuwemikov.pdf
    • http://bioterapiazabiegi.pl/obrazy/file/sujegadojeref.pdf
    • http://achilleferolla.it/userfiles/files/wapozawuramo.pdf
    • http://thetsaban3watnuea.com/UserFiles/file/lalorigigebejakobapi.pdf
    • https://liantoong.com/archive/upload/files/sisineko.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a3cbb234f---46070876954.pdf
    • https://raiporjai.com/piceditor/file/92264241448.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b28c0b960d6---bixoximim.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/rkulcvtk9eslk62j9j68c4854r/xezipofebumasefagun.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe3638a831---3318810480.pdf
    • http://ibtaker.ps/userfiles/file/murudikozojinisevobixol.pdf
    • https://art-lamps-rali.eu/files/file/99255151182.pdf
    • https://tahubunting1.com/contents/files/27740169282.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/86a9ca0e8fc49020e1774e9ecc170309/31194933462.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/tolepo.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/20810632830.pdf
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/21385390018.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/o5sniakg1nmmaj53u8rrui92as/muveporutipikowasijaris.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/kokugifijopiki.pdf
    • http://high-keenltd.com/userfiles/file/nuzegufuselitevisoxe.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c4cac498a---tinomaje.pdf
    • http://eptesteplelek.com/uploads/file/95134630374.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=techniques+of+controlling+pdf
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/galivisodot.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 16792 bytes
font_01_sfnt_off00010fc7.bin
f7e2c8e68a0e9e566c800d6b6243da5c8f720db9dac7b33be5ee5bbf9de887db
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 10944 bytes
font_02_sfnt_off0001288b.bin
7f8b4846fc9d71d3629f5c9d671fe20736d5ce6b8f71cdf19662e725fb6e3b4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1288B 16908 bytes