Malicious PDF — malware analysis report

Static analysis result for SHA-256 3136f51636f8226d…

MALICIOUS

PDF

91.7 KB Created: 2021-07-04 11:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 601da68dad24ae8504fe20f869ce5e99 SHA-1: 110a36af4f1ebb7b8ecddc28004e8965fc462a9a SHA-256: 3136f51636f8226d87f3d1edf228df536a87b3726a447b439d1e081ee99dfef4
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9522e6862---42223871205.pdf In PDF document text
    • http://szao-spb.ru/images/news/file/bilikaj.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/16704913634.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608074ef7d5ef---vetezepegosetejibiviw.pdfIn PDF document text
    • http://innotack.com/userfiles/files/pebuwetupavi.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/cabb46f898cf67eb8dda52091199f79b/xibukirepaponi.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/14af2a70e3186d4fdc8cda47ff181a80/zibag.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///pivevuvisasejakefibezinoj.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/90545313686.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/cdc553a23c016384740ed0a30dc16101/rafajilurikofubowemid.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/09jr5j9h0r6spsbhdle8pdehr3/19504115689.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae02369958---jiwuvi.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/395265541.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/gipupoluzitoz.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/9cc10875fb3e4a54302cca01aed205aa/12768275014.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/c30586g9rqgk0rj1dbiiib5fs8/47280117689.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/2100a1922e9f8dc89e47caff6e377ab6/wuwej.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a275ba5860---laguzujoj.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa8cc5540b---lumaxiwirulamotatafemabem.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/7jrjolenlhvniot5c4svn043h1/fodabosef.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/11197934019.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/62335536086.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/36438072156.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/87564475096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=shadow+priest+pve+rotationPDF 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_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 10672 bytes
SHA-256: c9bf8b554021532d3f141c99f26e7df4a1cae2028f28bb78893a5f16dbe6bd27
font_01_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 16828 bytes
SHA-256: 1533fbf492ab89e4d3a77ec3443d7689c2b03d9a4190a4e6f0bc4854f5815f06
font_02_sfnt_off0001499b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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