Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47ee51f58ee3960…

MALICIOUS

PDF

82.1 KB Created: 2021-08-21 00:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d4f87c7b6602e3680b3b8ef177085321 SHA-1: 86e6437d2751a0e3045765b06636044d58fa3817 SHA-256: a47ee51f58ee3960a0473eefa3f617c64eff2929f5ad504318f892447835bc9a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites or engage them in a social engineering scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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.saaegfpolis.org.br/ckfinder/userfiles/files/6980517869.pdf In PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/kibuzipalodosifumukiwade.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/16701350625.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/tu0hnc63mh7m555hjalmssakf3/27913388608.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/48100962399.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/fogetativ.pdfIn PDF document text
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/76280153169.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/zigadasewunu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/77874256109.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/k47jp4umr9qvpd7hkn33ge6f2d/64268792618.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1294d08955---mitugilepepejisewebij.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/290414111696.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef8aef352---72833969970.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/49635467192.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/7237756901.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/44921810261.pdfIn PDF document text
    • http://ausafe.net/images/art/files/tefelodumazonubidixod.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4er81f0qpmhfeem2ru9gbgi5d7/romanavajulejagis.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/vorilejunid.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16103008d6da56---75798760304.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/44918551095.pdfIn PDF document text
    • http://klefmarken.se/upload/file/18115983844.pdfIn PDF document text
    • http://askort.pl/Upload/file/vanopaparixasuguk.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094860812d75---88346973537.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/bitajoripesitawokuna.pdfIn PDF document text
    • http://vlajamo.cz/images/file/dawumajuruxefapoxifuwek.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/zerosafenosag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+do+western+union+numbers+start+withPDF 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_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 16832 bytes
SHA-256: 6ff299a0930adcd096b172f26800f732adba7ce81c6241a4750f5d363a9242d9
font_01_sfnt_off00010943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10943 10784 bytes
SHA-256: 118174a618161cd6e74ef91b366acd93a375f7d5cc361e8b3dbaa7f48e263e0a
font_02_sfnt_off000121f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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