Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ab31bd01542312…

MALICIOUS

PDF

72.6 KB Created: 2021-09-13 04:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72fa54c140ca9e9664b4d601aa6378d0 SHA-1: fd7716d34184ce198d03e9a2b2e00ed1f2363695 SHA-256: 23ab31bd01542312e1a1cd351f8d062c52a845b086295afed00da62a587efbcd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to link farms hosted on disposable or compromised domains. These links are likely intended to redirect users to malicious content or facilitate the download of further malware, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

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://smidgel.ru/uplcv?utm_term=download+xciptv+firestick PDF link annotation
    • http://vectorma.ru/uploads/assets/file/wepexakofapebotilozofik.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f2138612---tekenezo.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/99370031135.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/fibezuwenikonaxozejaret.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/59182695514.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/wedibetejutafamavimajerat.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/litolajimetatovububunize.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/kapikevi.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/79250902371.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/kubadotopeja.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/97347299994.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/jovukolopekunevevezedapo.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/57901628594.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/kolej.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/xanigofopir.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/65051042975.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/49537466231.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/a67da9a0bf84e0663ba85a5a4cacdff5/wovonijisudesuju.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/zopivirokizimipukaf.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/92990212775.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/datuwogozuzezatetakor.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359e332c8a3---doxexika.pdfIn PDF document text
    • http://newshop.jp/archive/file/xadaz.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_off0000b90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90F 10960 bytes
SHA-256: 1374e8c55270b0e76b5126314a2d0effbbf356d404a62eb44b4916fb58a11b44
font_01_sfnt_off0000d2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 16420 bytes
SHA-256: aa54a06f7dfd53fdbfa99e6f603ce2c65e28234736cf8745be801569dbd99006
font_02_sfnt_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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