Malicious PDF — malware analysis report

Static analysis result for SHA-256 a183908521eedaaa…

MALICIOUS

PDF

96.0 KB Created: 2021-09-06 16:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef66b7fd98c9698a41b8ef43d1a2b5a9 SHA-1: edd3f2f28fb6276e6f1a238a084b84562c089265 SHA-256: a183908521eedaaa893d7598c204447548cb361440a29c4b4e89d835da90f3dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive use of link farms pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/37fjkifm9sqqlc12fabqtiapuu/26359183196.pdf In PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/67cbffc8a936f87ef52d2440d386d981/xukipisuwe.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/mazibigiv.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/96447117974.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/j2mkamvu2c2h88m8mgmm25apbl/wolorewevavujejiluvi.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86737204017.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/26544310238.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///86367836123.pdfIn PDF document text
    • https://penal-garazh.ru/files/33058420266.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/menokopolizeguz.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/52737927955.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/r57bqel7neg5mbm9k2g2k0vf6d/27450495679.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/tobasebusofinopiniradodeb.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/57821d0dad8c3d8c4ebe83e053eac0b6/26514470840.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afa6d9e4fc---19315339374.pdfIn PDF document text
    • http://kleiberit.ru/files/file/zuvikedemazisepasanejow.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/9525b362edfd7730bda97e5fedb11e9c/82492675145.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/rikazavegewenevu.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/78987341567.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee34a54700---88212209623.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/vetiravudokukusovu.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/34106882179.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/lewamosilizodi.pdfIn PDF document text
    • http://harlit.com/upfiles/file/18339168098In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=paraplegia+inferior+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_off00010f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 19612 bytes
SHA-256: 08154c86dfd1c08da8d5be4e2daa735b0edf3805ffcad605cd5ccc12d078bf17
font_01_sfnt_off0001429e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB5 10408 bytes
SHA-256: 8bf840724c7da7e76b5df7caf2f0e644b2673765d639081cee46c72c6e84462f

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