Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ff3b1253e4fa70…

MALICIOUS

PDF

85.5 KB Created: 2021-07-21 12:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 48ae093635238432981377f623361b1a SHA-1: 7fe3955752c46caf601c7fba51774a285ff42dc0 SHA-256: d5ff3b1253e4fa70c6f8a7ed31cd998fa3856cb43c98d10f2d3c2730e2bd2568
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple PDF files hosted on compromised WordPress sites and disposable hosting. This pattern is commonly used for phishing or distributing further malware. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/la79bg3992dvrov9m1bf00lm11/12685902809.pdf In PDF document text
    • http://tatennis.ca/clients/29257/File/23167191542.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c48a831f5da---45200714605.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d1964487a---56778529620.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160efdfffd69ff---xoguk.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/itsoqnau10cg4sk294fggg71sh/31453196174.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8bf32fd0---jasedisarage.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/gibuni.pdfIn PDF document text
    • http://techbis.pl/files/file/15242684539.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/50635291371.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/791215d71ba964fc2bbd37a8b409c53a/dikawinanumaradoja.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/sewadutebikisekuwex.pdfIn PDF document text
    • http://gerocuki.hu/user/file/48457099741.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/d827fbc00237d20bf1ee2f9d70192c86/79510310572.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60171f252---funumefegawazumek.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/40805354516.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/71475744779.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6b03a562c06fff7d3e88f006c563746a/87928581817.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e48feb253f2---jaxemezunonofikurodar.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba76c2a0b7---ritelirudusan.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/27379439769.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c766476914---vafijejopiwu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e8961932f91b5ef4942e7126f1f1c1a6/44984655103.pdfIn PDF document text
    • https://successalpha.team/upload/files/nuduj.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/desifin.pdfIn PDF document text
    • https://masihpt1.com/contents//files/zidojosamoxafakiweki.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/98124717591.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/oblejfliv62cvp1ki4qt0tjgg4/fofenikuwuwef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=miic+health+state+mn+usPDF 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_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 16844 bytes
SHA-256: cea6281c150d02b7fbf686bc03198f43b04350860d0f7289314a80ca407704da
font_01_sfnt_off00011926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001313d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313D 10368 bytes
SHA-256: 607cc8ff87849f82904edf40a6e48cf1153a389b62a048d8e167b074ea3d0af2

Open this report in the interactive analyzer, or submit your own file for analysis.