Malicious PDF — malware analysis report

Static analysis result for SHA-256 89bbde49d45da504…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 21:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd5a283a6ae428a6a3204f3ac012520c SHA-1: ce76f270e116874e52d52139910a5cdd6b8541e5 SHA-256: 89bbde49d45da504f44a36a50a3fccb7e7d53396aeb136fd42dced29b7cf197d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=make+live+wallpaper PDF link annotation
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e5b667fbddc4c7aa1f1dc06ed9d5c4eb/54497817635.pdfIn PDF document text
    • https://bczenekar.hu/files/file/regekupamujubikiduxatamew.pdfIn PDF document text
    • http://paliukenas.lt/i/File/39552292038.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/10126473888.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/tiredugimelej.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210906_53C8D45936A9431A.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c62c21c56---56923532067.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/ludowogilirupekafit.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/53442221149.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/vitenedujimifasifodufij.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/96063394344.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/54992174376.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/46749936619.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/61042037154.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ulkanq27a7ve8jl9iigot367t0/sudituvexaposinol.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143971bcc679---kokonusotilisutonejupi.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/40426115338.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/3114353361.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/46183462437.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/blh9fet6jtld6p0m0082rolau3/11486532577.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/durorajarozarumufimup.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/joteminazoz.pdfIn PDF document text
    • http://sdds.be/userfiles/file/wojiporevizurimag.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_off0000c531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 9992 bytes
SHA-256: 6f09527fdd407306e505ae3735682119e462ff43e908a0f1c103b86c556a4916
font_02_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 16956 bytes
SHA-256: 5c6c6416ded9dee197a67206b6056b9c9ab4f3a04af58bb23da1905dc978d945

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