Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c23af420e2a4999…

MALICIOUS

PDF

155.2 KB Created: 2021-07-02 14:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0c7efe3fc39f157eb21633f7c13159f1 SHA-1: 26e0918a93c857a2004942ad9f4385e93cf6dfcc SHA-256: 8c23af420e2a49999fdd72e269252f432c8cb759eaa7e06c3c3da40cb0da028e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/2fc12dfcde2408bfa032a9722bedf4b3/38236731344.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d326787853---87656492036.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b47fdcb06---64353716927.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/lemc6sqlveo90qo8pce5a48t35/wiwamifosaluname.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/15591114242.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed2a211a1e---29650163526.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085255f22a80---wizidewetabexizajigexozal.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/20025503523.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/nasosenililedakexo.pdfIn PDF document text
    • http://planbmedia.hufiles/90630029253.pdfIn PDF document text
    • http://padgettlawreunion.com/clients/79772/File/69981309024.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/88950145715.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/70026793639.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae850e744e2---xilerufe.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/40947426397.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/n9iolqk7ke86d1bc3hrc1fgaco/kipewonutisogotilo.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0tmsj6ffaogggedb5o0p88iqn/zoratanatev.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/rupudakow.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fc63d2058---mapokid.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d1684fa83cae851bef050fe2b28adaf5/jomariwasatumo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d754461bc6---26918243278.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/73616e32baaa479dc8f8ef9575cd9e8a/nikijufusazemijimubuzojom.pdfIn PDF document text
    • http://vodnik48.ru/content/file/78402971260.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2788603ef---lekadoguwanejimekokaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=largest+crater+on+mercuryPDF 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_off00020212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20212 10604 bytes
SHA-256: e138c12ff41345b363afa1edbad89049a2e1b35a09bca4ffcc94bb490cb7ded2
font_01_sfnt_off00021a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A59 17176 bytes
SHA-256: 8f9fea35439a60e62bacd8a936a643012a8312b126362521978f558b4a4b0ed8
font_02_sfnt_off0002473a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2473A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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