Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87a638a92dd28bb…

MALICIOUS

PDF

81.4 KB Created: 2021-07-09 15:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ced6be1169993e938fabf75c0178c2b SHA-1: 23c8cd6eae0a4dd1733b41e9f33b1a9702edfb29 SHA-256: c87a638a92dd28bb3b53683fb1ba18c785199a1187832ecf9181f200f3729e08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The PDF structure itself does not contain executable scripts, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076508c9009f---vidalumeroteduti.pdf In PDF document text
    • http://abogarestudio.com/userfiles/file/gewewubajelexekulerore.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098439f75214---jakosuwepuzuwe.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4e434ff5---9517094035.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/5332619396.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a7a3b0f8dbe9083f99bab6d07b1d8d1c/86581389015.pdfIn PDF document text
    • http://kfbi.ru/content/file/36740838849.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jn1eovv1ao3u1rc8nr4isqevj2/54161128583.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/rlpsnhb9ldfnehnqnah6lc49g1/45524050362.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d00438230---92477992940.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/25d6fed7befbc0a7a330e74f62a5c7a4/60452203980.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/pn2p6pd8tabbrfdnj53c4lvk7c/galivomewu.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ee64cbcc95e1a97503704fd3d5ef68c3/58309401037.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160780edd95c89---23570947265.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/b5ih3kcmpin7g55ned6qp97n62/genojovapimofezilinufil.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/ac253fe4163ca7c3c1489bac35fb14dd/lobonovamorowulubuk.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///livinabunabekobiv.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b1182391331---501173671.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afa70cc248---zunanafego.pdfIn PDF document text
    • https://digireg.cz/upload/dipopinuziwezetejevonilaf.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745b3d8940b---lodosa.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160821d4776fa2---bowebavuka.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/fixosuguvadiresonutosomi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b630034d62e---95038876659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mchenry+county+assessor+property+searchPDF 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_off0000e0b4.bin
a0a3ee873a8ddcdb5ada649b4c928bbd94ca6e918bdcca376e86988c49138d3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 15436 bytes
font_01_sfnt_off00010831.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 16792 bytes
font_02_sfnt_off00012048.bin
ff3dbed013e50db328eadcd8acff4e8d1ac497defa6ea0a3af7ebc0285a28dff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 10540 bytes

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