Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4c1e7e49cdf966…

MALICIOUS

PDF

87.6 KB Created: 2021-07-31 13:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc6d6e031b388a0fd0039c2cf853511b SHA-1: b12360be032ee47ab25ea63ccf3a1b46244cd66d SHA-256: 2f4c1e7e49cdf9662f8d6cd02771bd7245ca0d9fde8cb2dffa8865cf84e51e9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lateonsettay-sachs.org/userfiles/file/woboniwifazovibuja.pdf In PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/8c23be0c44510b7643237a52a196ea66/34651603397.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/tutuxexor.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098430a120da---tigatilupunepewesugokared.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/15447478595.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e3f54d4e6---40770897612.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/57610561935.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/64536297645.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/6169703226.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/samul.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/binilejegelak.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608057dc5175c---sapupekebaronifere.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c5527c24b45---savomovosenepuravelen.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/vf14famass51dip1ciqa9pasij/wonowigovuw.pdfIn PDF document text
    • https://ekransamara.ru/files/28212832717.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pujanenidewinatap.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca3c9aae19---12761733474.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/84840890867.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/21401113550.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/cca38cf9fdff146c3948ce69b00ee399/todadoxovime.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d7231b67537---90951642833.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/xomodeferava.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609336bc72544---vofebadurus.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/kelebikumebasujet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=diario+de+greg+16PDF 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_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 19076 bytes
SHA-256: 94d13b12a2d229164078d7b28259d2e01a1a14758d07dbf857626928563adf19
font_01_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001385f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385F 10228 bytes
SHA-256: 20ae3dc1c3cf927ec43534bd48b7c7630ba7a9309b6794816263cec0a944a738

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