Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00bbad1d380d833…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 20:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 81157f26d6d2e05575eba8304897d667 SHA-1: 07705522f8db637777c39d2f54c823cdd371c681 SHA-256: d00bbad1d380d833a6d2160ceb5ebdcec61b41428e9ae03768b9c07a1efb0bba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=how+to+increase+instagram+followers+for+free+app PDF link annotation
    • https://cafepiolho.com/uploads/assets/60353132110.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/6015891705.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/pupexazosudupajuzubibe.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145af8f7c4b0---tafedadi.pdfIn PDF document text
    • https://paperland.bg/uploads/file/62741472171.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/79065032243.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/81415062092.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/kosojurodosi.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/87350456459.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/85499068999.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137e06e243ce---87076070055.pdfIn PDF document text
    • http://www.puhito.hu/uploads/65593802587.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/gimudubanatagefago.pdfIn PDF document text
    • https://durimawar.com/contents/files/nejilom.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/jofub.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/soxiro.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/16014140148.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/delokuvi.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/fb707e8ae891fc28d536235f594535cb/8097773179.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/42932732597.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/79391442921.pdfIn PDF document text
    • http://vit-physio.de/file/kozusijutob.pdfIn PDF document text
    • http://dhf-china.com/d/files/16403056716.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/59710574681.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/55276885636.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_off0000b2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEC 10900 bytes
SHA-256: 95e30bd74be1507802ca46c0916089961f95cc14c53603188344c9fada514a14
font_02_sfnt_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 17196 bytes
SHA-256: fff8c22f642e94af1c4559dd36f318df0cc43995eb1a999c7e2d63b2e24d377b

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