Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7af7f8a4e6f11de…

MALICIOUS

PDF

76.6 KB Created: 2021-09-20 21:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e81ced86904084d1242d8cf951803a9b SHA-1: 5e2b6d39c5f393966d69d69e9be453ed0323eaa0 SHA-256: f7af7f8a4e6f11de4ce5d1ded03f1cd7213179b2c338210b2e48ce1db02aa365
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 executing malicious code. The PDF also contains a large number of external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

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://archism.ru/uplcv?utm_term=thop+tv+live+streaming+app PDF link annotation
    • http://mynigaoe.com/upload/file/20210921024843.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/palokedoxarimij.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd0ad5a015---bobimiboje.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/luzus.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c5b59374cbae3f1c972348b9c737c5e5/tamewujanuladuk.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/baxap.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/84938644474.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/713c67af0102e033f3624ae4b3ce6a03/favakiwumavagepenavasila.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/debugepexozapelago.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6fab96780---10987415580.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/rotumaziwulogiluxa.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/76317531041.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/63027063337.pdfIn PDF document text
    • http://identik.hu/editor_up/kuvapav.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130634bbbe32---49286012279.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/safibalotime.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/bilamilugobaxusejasoxosa.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/gozodonotijib.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/wipumagulakaju.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ao0t5kpbspnhsmmptegkpgh8hm/69206364128.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/padekavimujurakaz.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/27406193594.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/zavizubedapol.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_off0000c44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 10728 bytes
SHA-256: 661ced78d6c9f261b7aa458be0c4194a52f37a67688e77fe941b43ff2f519cae
font_02_sfnt_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 18252 bytes
SHA-256: 6d57aa97116e71fee04233500b4e1fcd46cdb0065a494da21623640d2d0b0cea

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