Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a0be9a8e1789be…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 10:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7a19d139970b1d7b39278eef3c13b7be SHA-1: a391414c916f6f01fea17b7aeb02adcb708d17b5 SHA-256: 99a0be9a8e1789be6f2629573f57c4806424233464ed0aa5a967eff784645753
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 within documents. The presence of numerous external URLs, many hosted on compromised or disposable domains, suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=percy+jackson+the+lightning+thief+novel+pdf PDF link annotation
    • http://abbeytraining.net/userfiles/file/79243733832.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/90466219620.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/wenakut.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/00e3c2f8c1ca3ab5746b825af26eac1c/famugejitimokepeludi.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/7907527511.pdfIn PDF document text
    • http://happy-land.hu/editor_up/dorofizoxabewifogevun.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/8821902619.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/bedutafive.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/walokeropalikegar.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/tejabo.pdfIn PDF document text
    • http://www.puhito.hu/uploads/tifuguzefonisatife.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad6518b36e---sexisedoxo.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091704493973499.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/sisarazugoferevulapadew.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/lojifatifimovodepo.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138316dbc7dc---85667681650.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/36049673590.pdfIn PDF document text
    • http://bdn10.cz/files/file/rovaxinoropasuki.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/58318519400.pdfIn PDF document text
    • https://solturism.ro/images/file/94157348709.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161330924f0a6c---biwaduzilubew.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/jixararorowibejefajimat.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/70900217912.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/lezakizireliloliro.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161363cec53b3c---97163065679.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_off0000d2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AC 17588 bytes
SHA-256: 78594eefec1347bda4557296c029b3928f6284a0306f289989eb5d5a44e68241
font_01_sfnt_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 11304 bytes
SHA-256: 80d6eba42bc6e0d0f3825fa273eb64a7652ed99fdc96e2eb86fab5fd7ebe378f