Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f3d3de850ab7c7…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 09:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6dfc5a4db6bec9ed6aeba0b01a02cf09 SHA-1: c49d52a1e346b3b798ec2ec2c51d93bbca891227 SHA-256: a8f3d3de850ab7c785f851fd76f50e6ce51b6c13139937da1a4f0281060bfae2
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 to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

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 http://svadbavmoskve.com/content/xuploadimages/file/fexubisowaxiwom.pdf In PDF document text
    • http://giayviettri.com/img-ftec/files/taxis.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/murebaxuxuga.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/femupeg.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161451cea7f23f---vefikez.pdfIn PDF document text
    • https://majubesar.org/contents/files/karozu.pdfIn PDF document text
    • https://parkettworld.com/upload/files/77492579222.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/90897519144.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/ripexulirevudefo.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/satafajilesixu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161330fd8e1c9f---nuzuzijoboriwotilex.pdfIn PDF document text
    • http://m2m2design.com/userfiles/39283547360.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/4302365600.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/didiguvatetorifa.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/n7oolenf88jelct1u831dfk2o5/sufemisowoveral.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613024c06d913---64974989753.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ss0kpd71kaa5shkuuosl2f2ra5/zekugebumugafugag.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/dabiriselewipakaguwituz.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/vatikunan.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/roxowetumoloxuwe.pdfIn PDF document text
    • https://etadelloro.it/images/file/vepokorotimi.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/fajukup.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/35817038491.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc172eed5c---nonenibikipifosepu.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/78463271468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pilots+in+top+gunPDF 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_off0000b441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC58 10136 bytes
SHA-256: 987972fc5a17348d14983b51a656352e83bf544442e7c494a68e6a4a97d41492
font_02_sfnt_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 14492 bytes
SHA-256: a6f4f92f5ebac688bab6ee66a83c0afa439dcc3d35e2995a6e41f9414d493789

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