Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a58dbdd97feee5…

MALICIOUS

PDF

84.0 KB Created: 2021-08-12 21:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c8c5111a89560be34919b7c82419c6c SHA-1: 030d543fc6c4f8a1b913b12671c1a67ffea82786 SHA-256: 91a58dbdd97feee594ce4aebd450f811f61d2d44d9bf7da7e9bc4a82abb73e2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://philabc.ru/uplcv?utm_term=inochi+no+namae+piano+sheet+kyle+landry PDF link annotation
    • https://protradingindia.net/userfiles/file/53833284879.pdfIn PDF document text
    • http://xycrusher.com/d/files/36507981226.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/vuvepujawutawejozodi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b6e366b84---20082400776.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/cfce489a49af2b71fe043499df581afa/vezisefebe.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/88178936805.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/012dd449ae70870629196e04f9225006/wamoga.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/tazubuxidoxopawokigidejiv.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/36423828297.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/d84c22d3b6c10649cf28ffb5bff29162/kajiv.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/fotika.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/27326068695.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/99624164963.pdfIn PDF document text
    • http://liyangah.com/Upload/file/47298592389.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608401e820d25---48940480355.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1edf6a49d---63985172829.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceaa395118---99209643379.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b52b6cd21d1---48232890439.pdfIn PDF document text
    • http://jcpingie.be/public/files/21949619613.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9365c3ae24---xezowodadubikufazepol.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/78614767883.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/zelivolilededipuvumutige.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd6c8178cc---kijexito.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e85b00e00---gipenid.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606df106a01ad---jojugabarimimekatomosiwu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD661 10936 bytes
SHA-256: 45f43a89804d3df79ef48122709ed09920b509a90ffce2c16367db1f6eb41603
font_01_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 2744 bytes
SHA-256: 4486d6964cb36216fbc1634a39283782c581b54d0f4ecb3bfb6679f420657ad8
font_03_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 17144 bytes
SHA-256: 8d9fcd53a542582114f6615d00891bacdd23881587ef47810efd04d9e4c55a42

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