Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd5c11b4447c4ba…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 22:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8fb1943c8a15022fc50875126016a492 SHA-1: b628cc8ccee8c60ad2fbff454909ca078cd33ee5 SHA-256: 5fd5c11b4447c4bae852033e9d86f4a0613ff08f4464becf726b504608509c10
156 Risk Score

Malware Insights

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

The PDF contains numerous links, with several pointing to compromised WordPress upload storage, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://airmon.hu/images/files/mibewegadavewajigopu.pdf In PDF document text
    • https://laptopserwis.com/app/webroot/media/files/pasovukudep.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/37441283018.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/lazazizol.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161315e2a33bc9---56640317154.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/wuvuzuxafefed.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/520303b0c036d48f17660e6358065f01/59771076184.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/xawegupeganutironovoza.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/rimufu.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/26483562827.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/2206606289.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138d2ae0de7a---52414105774.pdfIn PDF document text
    • http://bushurov.ru/images/files/nilixikawemupamojo.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/59963414120.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/puzunanomemuxiwulu.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/xakamunajemofojerigutas.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/118812403.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/xodabobaxoketik.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/xunonakunowewobamabikiba.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/49015392111.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161323ba19ecdb---funamalezep.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/80758394734.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/jemerukejedojamexexisis.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161328cf78e0f2---kalolilejotewotupaxopalep.pdfIn PDF document text
    • http://screen.by/images/file/kavowubat.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/nagitonejudoxedukedevalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=offline+moba+apkPDF 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_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 10412 bytes
SHA-256: 67a09c368cb4ade1b56623fe4b47376ce448f8cacef6b9d7751d3ec20f397114
font_01_sfnt_off0000f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0D 19752 bytes
SHA-256: af3a632e780e3cb0d09df243410d16e2a16412d0319ecd17b31d02e14295d47c

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