Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4bf351277858a4…

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 12:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5205ca40ce11190f47bf3e2ec7f28cfa SHA-1: 188cbb2bf004a5f846aa805c1bf18a9f99cb370c SHA-256: 0d4bf351277858a42d2352c390c3cbb52c2fd189665bbbd82b97d2576b0a45c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/juzasimoter.pdf In PDF document text
    • https://mimpishio1bet.net/contents/files/56861241056.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/91635141284.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/8089696930.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/davowogozabujokoj.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/mezapiv.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6a9530f12e4ab6a928e888812c80567e/75932859458.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/nuxadesimimasevusomeseg.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/46790043897.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/70e910a3cef7fc9415b913b2f8bbf113/nisipufejamivuxo.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/sajeliboxebudobawo.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/11602545464.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/rufelovegameduv.pdfIn PDF document text
    • http://exima.kr/userData/board/file/57093280598.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/boxojopojeg.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/kewidogexun.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5e93bbda13c76b846301a2f020879cd1/boguzunatogesuxuvetuwan.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161405e5985e1a---4860018014.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/dusejalesazarejodomonaza.pdfIn PDF document text
    • http://baoveantam.info/upload/files/5355280799.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/svuo3hka8diaqtos0105q56te4/bitejuxopurixagamudovesa.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/80660902518.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/85723214926.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/wedatakejoteje.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/42708919557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=redmi+note+5+pie+update+downloadPDF 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_off0000cc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4E 10652 bytes
SHA-256: 013934847de56fffc661eec4988d055ae60795783e16c81e1030a13621b1309d
font_01_sfnt_off0000e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 19308 bytes
SHA-256: 84e4e3e9e346ab0a276cfe1fae53ad455c8a5de02f55c1ca0b8b76f8a47ee209
font_02_sfnt_off0001178c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1