Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1f741888fa2f56…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 04:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee4e16fbd11a4af24a694b4b0b1d9c93 SHA-1: 20355c99180452cc8a2ffda6b67d1ffb3071cd51 SHA-256: 8d1f741888fa2f56e85c10d967206cb3cdd51764768934d252383cbeccdd0202
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=like+message+android PDF link annotation
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613534649d327---62409480208.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132e48aaf836---80228330442.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/79810389079.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/30046323540.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d101cfe2---kugugudevujasomedog.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/70232889419.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/kupujepo.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/96137015629.pdfIn PDF document text
    • http://demkapi.com/resimler/files/wosurebenugi.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/pinebelemipagutofipajafu.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/mikokexajimivavafoba.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132cbcd63a0f---82648244217.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/5858885042.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/xopafozugopefagatak.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/6812096030.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/36147132514.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161395c9c30634---15321072632.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/diborobufu.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/zewanofozodavajixamafara.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/mijasixekedagif.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/53209806493.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8dc4b8b02271b13abc4c405a7df85989/moxabefimidafod.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/09/24139146886.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_off0000d688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 18068 bytes
SHA-256: 1197f30ad219c90125f1aa227878ee933a3e3addb980deb323162dc4757fa743
font_02_sfnt_off00011e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 10496 bytes
SHA-256: c89930e4396267bdd5525f9efa31a7ee7dc5ef39bcf7f0e89f9894842cdfd8b8

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