Malicious PDF — malware analysis report

Static analysis result for SHA-256 470e1173fd0fdc54…

MALICIOUS

PDF

93.4 KB Created: 2021-07-03 11:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5146c07b4342a5d5d68b4f2b5f4fb81b SHA-1: ed0f2a2162fc48797902bb0acfd71a7e9caa2169 SHA-256: 470e1173fd0fdc542e9faf3fff50bf457b6b96fc747bada0b713ab976ccd0f44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608374735984a---wiximin.pdf In PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f288107ea4---doleremufofenirarolojopuv.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c903e7e00b---59951513319.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6aeb7275e---62338801231.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f617bed28---vidobilitiwa.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/23d689bfa0c8c9892d7370db8781dc72/suwevetejuxolax.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822740597af---lujatadibulogotizogixet.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071f63d1ef99---zunevematuwekibodimozamow.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/tedajafagoz.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/kolilojasi.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/82692523775.pdfIn PDF document text
    • http://vo23.ru/upload/file/jeraka.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/4hlsfbng13239e32mf4o52ink4/13813157313.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/dawej.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/aa0a4e67b6c323b1387406aadb6ae7ab/vumusu.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/9379913867.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b55c041aa93---zidewuxekugumetamu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16070164db576e---gozonurez.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e8dae277---36360306619.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a395fa7de77---ravavotironabiboguxip.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9caeb76c5---89326326635.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/lixiter.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=my+playhome+house+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014774.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14774 19496 bytes
SHA-256: 35fb679be61eab6b2654230a41fe471a48298c725e308139945f6363f8ed2e9e
font_00_sfnt_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 10424 bytes
SHA-256: 81a33e6b438a63e31c9c3196cc04fdc0231fc776c09aef23eb13389121244854
font_01_sfnt_off0000fe4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4F 19356 bytes
SHA-256: 3c291f21aa90055452a0e235d1b588ae5440623a678a0068da69bed2106f8d90
font_02_sfnt_off00012f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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