Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acb342be47febb8…

MALICIOUS

PDF

89.6 KB Created: 2021-08-04 09:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 307b9a3fcafb7c0e8f20a73acd0c50f4 SHA-1: 3b758d6a9a43df974f0788d977b8b5261fcad892 SHA-256: 8acb342be47febb8506bbe9d1bf2f3db9095b3d6dc7d1d1154484674818d79e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of numerous external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=what+is+99+years+lease+india PDF link annotation
    • http://veraschwemmle.de/fckdata/file/bidipuxav.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/gabefuxewo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160885d71977f2---sosexudur.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/79d252a501f620da691e8059d58b212f/83632799446.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/leginenurubemokawaj.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c186c1ad85---xosoj.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/perexep.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b87ef9578b---xibut.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3e2520a36---fujuge.pdfIn PDF document text
    • https://areicon.com/images/file/59503910987.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/jomifirikilasekanodi.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161096bce2fd41---9876816585.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084477d7ffce---vakulizogixetefapovif.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/84671424551.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5b997b03c69d06932b44834a69430d3/sutavurijepa.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210624050841_1851526655.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/xurujavulej.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f01c834aafd---31003517097.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210603_79F7BA719F6F093F.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97aefcab77---26741363964.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ca9372b9af75b00d168cc0e1eaeedb66/puwovojutajuxiku.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/zusimogexotagozapuzukop.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/digirovevuku.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/25347272300.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_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 10500 bytes
SHA-256: 7c8fabd1bd2e311d9a76826b02e4ec69216236ef9865aa487e192bdb8b42d55b
font_02_sfnt_off0001284c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284C 17976 bytes
SHA-256: 7ee38cfe5a3b3a063a095b3fccdc81df65e4bd5d8bf33613d70b11f79bd81a68

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