Malicious PDF — malware analysis report

Static analysis result for SHA-256 548f287ec46ad90e…

MALICIOUS

PDF

77.9 KB Created: 2021-09-03 08:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe6cdaab8036bde66948ec624393cad7 SHA-1: b1b5f54e9c86b8ebd01ee0ed523002ef0036a753 SHA-256: 548f287ec46ad90ed52b940233751597004229707eb86f5158e51ce40b195125
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest this document is part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://babamoleskine.com/files/file/vidipivujoruxol.pdf In PDF document text
    • http://piemonteforyou.it/userfiles/file/wadunutivesusugop.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/foporuliwigomizosad.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/40302967987.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/j0v58m7ssc5plmko5pof8830kj/lagiwawepub.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/14589090717.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/78716470339.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc76a3b079---molikeguw.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210808/file/16284013632447.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/434da9916730d4ba84701808861e55ad/doloropizegokorimibutivaz.pdfIn PDF document text
    • http://xsjprinter.com/d/files/kasiwewakotifetulexe.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d168f41711e6bcebdae3dcbb5c5422fe/65975016155.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4138dee277---sojabikozek.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/64240398796.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868744661f2---bivilig.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098a48ab744b---vafogekukukorukixorinojil.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a76b208c04ed03206805fc269e662bc6/fanepavemeletitom.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/38pqarvm0tsmooj6gq1j7i2p9b/gosimuzavuvoxuvovubotuji.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/176ad16b8f8779331b2abedc3f8c2116/ledafiluw.pdfIn PDF document text
    • http://hasyo.net/files/file/xugezales.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/30266712386.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160731f3a38fd6---26045951792.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/42508498683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=proceso+de+nixtamalizacion+del+maiz+pdfPDF 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_off0000c962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC962 10944 bytes
SHA-256: 9d1ec0c82f16cae60cc14ab7a1e371a63d464084da42b56ed96ce52317680780
font_01_sfnt_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 18620 bytes
SHA-256: f681313bffa3e11427a64b51f19958feff4b87bea93572a9655ecef9d49b00ba

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