Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8e14b3af89e541…

MALICIOUS

PDF

90.0 KB Created: 2021-07-29 22:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64eebb477a6d4af46032a7411a4d0bda SHA-1: 02632a0313a2d5c3689d6aff42dd02f7778eaa72 SHA-256: 1f8e14b3af89e541789d655df8069b986d1113ea13c7648b8f6788169c6529c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/042dc6a9f3e6e14b4587d034134f56f3/vakufilironetivuwupivag.pdf In PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/661d4becaec5dd803bb9eaff83e81751/30938501475.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/74608321033.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/79791713451.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/pujobojilakojujuvad.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/84828997957.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160755eefa611c---75911546289.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d00b9a09492---45222549215.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/30156051451.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/39a8e33fc1abfad912c86b6470815512/finuzavex.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/88350797808.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/a4e932dce3387cdf2e5903c73b635895/68990055614.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/fumovonoru.pdfIn PDF document text
    • http://beiks.info/public/file/62008308387.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fb8adde0d---tesuwafefaj.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/d80afp39eu7hkvletk0rmo43fa/repurafaxewegowafemanewoz.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/d04ed8091f124fd168d2164b3fb41f6e/49272602838.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/jokatuwotojum.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88dd2f69a---62781010486.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a47d9f3f07e---nurisafokifogino.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6b92cc78da60bd86eed7736aea8088c1/30791135201.pdfIn PDF document text
    • http://billsky.ee/files/file/mafisidel.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/52039138082.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/tajowedisabi.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a24cf0b35d7b05281d9635cbbbb5af12/60932535166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=resumen+de+pelicula+piratas+del+silicon+valleyPDF 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_off0000f7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF9 11000 bytes
SHA-256: 9a0abf1937d679822b9dcef8632143ee2587f49b448a71134323f3ca6b0b6e30
font_02_sfnt_off00012983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12983 18224 bytes
SHA-256: 86facd0347adefd09ae48abbd71bc69001d53ec0b8d0fcd1b37c5efd275b7b7d

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