Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4ebbc3b4ba5915…

MALICIOUS

PDF

88.5 KB Created: 2021-06-29 00:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 49c1349cb9dc0bbd9e1308acf57cd345 SHA-1: 5153b0382ebdb6f402d07c8017e82a1afc43fa97 SHA-256: 8d4ebbc3b4ba5915b3e386689d0aabb6fae195e6239f9f5c8f397673c3f41819
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The document's structure and embedded links suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=magnetic+field+equation+for+a+long+straight+wire PDF link annotation
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/0nm9a3fe44uvqhi1jv816el70k/kijinudezugu.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/15511761326.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734c5337d33---79606783065.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106221702.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2702049b7d---daluxitimisudebegivuzulo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/96023421592.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/zevosifoduvawi.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/jumabapinifodovetav.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/42463667260.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/katurozidisupulovux.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/98503638707.pdfIn PDF document text
    • https://ismart99.net/upload/files/55263816839.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095ac25b2eb3---vikabamevuri.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/31591730605.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/62297663904.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/90325627125.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/toxoripenutasesonoxedat.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da386223536---93501960.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/zamaxuwom.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/83950105302.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748a0587ee7---vuwijukotululotexuw.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/22108450846.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a462d93960b---21505922053.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/45925d2de00468311873d20468e88d2f/56150883047.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_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 17820 bytes
SHA-256: 61e9dd76f3bf3ae214a21f6a8a9dc5cc742470f7290eddbb99fcf6cfe78c3e95
font_01_sfnt_off0001214c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13963 11080 bytes
SHA-256: ed9cc188bb1a6919a4aaeae20e4e9cbc8432c4025feb9e283d89c05d00de6ee2

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