Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a7737d4706cd5d…

MALICIOUS

PDF

87.6 KB Created: 2021-09-14 08:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7cd3ed4e923d0f395f9b431c50733f98 SHA-1: 2117449deb33b237be01be45962a2b9190df384a SHA-256: 27a7737d4706cd5d7d774eb275a9cdb231aae0b85d395068cffccf72fa65afb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs, many of which point to link farms on disposable hosting or compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ClamAV detection of 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=lord+of+the+rings+fellowship+of+the+ring+pdf PDF link annotation
    • https://satesayap.com/contents/files/7527817433.pdfIn PDF document text
    • https://simorgh.it/uploads/file/76762182984.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bce8492506---75134440592.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/60026977123.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/sazagej.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/meguwis.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/pafuxakojifamalazixib.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e998487a9---18367183879.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/lelajedopenumozalolu.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/60072158029.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/valezurifotugijodeka.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/4546866134.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/nafuzijafumokewomi.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/ruribivaxeti.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/lutapexobo.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/24146275360.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613894b0ae4dd.pdfIn PDF document text
    • http://labsshop.com/d/files/zazab.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/65b37f25bf3d41dea291c435295170a7/34992665356.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/pitazeginu.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/linumokapurirazulutedosi.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/rinazobix.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/74bc7b1b136d412fe973bb69a724cc06/todadixewupiruj.pdfIn PDF document text
    • 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_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 18392 bytes
SHA-256: 4ee4cc6cd95dc32ad036ae67c0c51e89f6d4b573b21a769d46326d05be7089c5
font_01_sfnt_off00011fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE9 10656 bytes
SHA-256: d312f9138fe7896daf315a4ce5956ee830e0738d91c7ee68ea096ba928919a20
font_02_sfnt_off00013813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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