Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb35986e0ca44a5f…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 15:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb671207a191c37c6b74d8266645be78 SHA-1: fc07d84fe698b1e9250d5267994b5cd69b2600fe SHA-256: cb35986e0ca44a5f830c8b0ae3a54b78d2608e6bea85a09fed2943b495b77247
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while numerous, do not appear to be directly executable but serve as lures to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/s7sgb0vbcajaeq2jdkh5j5ajg2/bejipubedoxipul.pdf In PDF document text
    • http://jikaramen.com/uploads/files/75284087183.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219142029387379.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210903091702.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/64197274412.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b1496a011---ruwafimitanu.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/darizegofiwajija.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e78c8df5---kipuk.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/zoguzotusefulamotewude.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210904145152.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109160546297712.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/72651224056.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4325b80c0e51873338b1299a69a0810e/vonawelikigafolofi.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/36772808990.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/59780641070.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/3312800387.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/jilugifupesemud.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/75469266782.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/52025191403.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///30445077048.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/tivanabelufitokufe.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/957cab8547622062c3ba9b7959ff0e22/fivuzu.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/q4f7rl1al6jtkpl6i94cpe1ca8/leginurer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dzongkha+keyboard+for+androidPDF link annotation
    • https://easyown.ddproperty.com/datas/files/bipobabukubive.pdfIn PDF document text
    • 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_off0000bc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3E 16916 bytes
SHA-256: f71a3a35c8e3d609352a1c4aa7d77067ab17fd65e6f7658882d76fbc7d58df2e
font_01_sfnt_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 10728 bytes
SHA-256: c6df456ba1fc2ed7e095cc84d446869921d20043c84c641b31831e3006cbd5c2