Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b42ad16496a2a96…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 00:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3364b179a95f2e79b5d7ca9af9d9df38 SHA-1: d0e9ec291051351fa3a25ac7e9393fcca2b7ff55 SHA-256: 3b42ad16496a2a96f2b48e49f409c43b0a69c4c84a5fa587d0d73e30052a8316
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=structured+trade+finance+products+pdf PDF link annotation
    • https://pharmnet.cz/ckfiles/files/files/fagatadisuk.pdfIn PDF document text
    • http://lagrupacio.cat/file/99130164237.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/tafujazerikipet.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/40989058454.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/wuxuxawamegiso.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/29750999383.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/7770926082.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/86937814428.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d296fd8547---lokivebefutewisuwujas.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba2a64191---98454700804.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/10233520868.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/25906773443.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021580431912.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/jnvkr3ul26mt76lg897rb9luja/87847485120.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/be1b3ed9300504446841c14df351e0e1/puzizumipone.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e237cfc94---kapazevubikovefawetefumi.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/lerogowetiborori.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/89b3514021becfe68ce7ef1c044fb377/62039529393.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-8-18/20210818023249969586.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/9umdmmhkqph1cgu07v6p96d7nj/noxadavunewa.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/e6f4e37fcd73bad33da8de4918e025ac/rufisu.pdfIn PDF document text
    • http://bronia.org/userfiles/file/80975599439.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_off0000c71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71E 17100 bytes
SHA-256: 2b12828a775c67e61da04f39844a59b5c1afb5428191ac05a4e9840a7ecb083a
font_01_sfnt_off0000f36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 10744 bytes
SHA-256: 0695c0b57b1b80c38bb09b1ade7968c4b6d67e1c0aaafc051e1f548acfe2a974
font_02_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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