Malicious PDF — malware analysis report

Static analysis result for SHA-256 842aa3437c90f480…

MALICIOUS

PDF

94.3 KB Created: 2021-06-25 20:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 803c185ff1493d5fe8bcfc7d6e039469 SHA-1: c4099a820fb8e591b565d7784966107b969af8a4 SHA-256: 842aa3437c90f48033f1470a687225e2f784e1d331e42b01ad15c3f28f87998e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The document also features a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sjalikave.hu/pictures/file/wiredarukepoxoxabifo.pdf In PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/g75e3v5lind8tksu8solnuvv02/62388824797.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e6e9bb4f03c53bfee466d8222e02ea57/lomitozipovatepetuv.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c62ebd83d---78647459796.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079749d43d3e---64642891067.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0ff5ee1d933b4790d1df35e395e8f2d3/2085338286.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/siwiduxutumogudidutaxuvo.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/79794460096.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c274edebc54---dipokabavodijifubenogi.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/4765456425.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca526b6e1e---witofelifovumoripefitezu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a775f327cd---punonatotep.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/jtfj2gbk29j51p3csuoeuqhcam/famivurenefojazili.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160887c4a3850b---vukuvixenufonarikegadog.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/fubagevus.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788a0caa0d2---togerewepe.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/wimagaligevuda.pdfIn PDF document text
    • http://beiks.info/public/file/panefop.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/janavevebawokozo.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874b5959b45---lemofo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b576fa16c19---ripetul.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xidogajuwiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=is+tea+a+mixture+or+pure+substancePDF 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_off00010e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 10780 bytes
SHA-256: 5b4b91e89f97c2d5b91902c7ef56a8dfc2ef224e2d239e66daddd979a2625b4f
font_01_sfnt_off00012708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 17144 bytes
SHA-256: cf6f266a4a07930b6b2546e4658e00668b46849d231ea587db5fc775f8f16353
font_02_sfnt_off000153e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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