Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e45c90fc961ce8…

MALICIOUS

PDF

76.0 KB Created: 2021-09-13 18:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a9d4ed04a2a272856da91596ab2b389 SHA-1: 9ef2c12929b508e5f4c8b0b5d8ddf07809a129ef SHA-256: b0e45c90fc961ce8936f1b8edd20f6a2b9b55292d0cbdc1d08a6f21ac9908ff3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pixomot.ru/uplcv?utm_term=insanity+workout+videos+free+download PDF link annotation
    • http://aan.kz/ckfinder/userfiles/files/modewivefap.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/10952992031.pdfIn PDF document text
    • http://rurisnet.org/images/file/pulixafiwumodekegovuma.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4339b8059---94488051603.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/suwewusodawokeju.pdfIn PDF document text
    • http://pk.mo/userfiles/file/dawupuwudikozukuxajumuzi.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/58252466557.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/5642815257.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/14362596110.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/48672021911.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/75072703028.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cf3f4df03---14942388337.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/73834810659.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/94682542638.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/memep.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/malononifejiwuwam.pdfIn PDF document text
    • https://gdaniec.com/upload/files/69184876312.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/87112778049.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/vabelomufeb.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/49874925054.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/38644250781.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/18584403605.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132baced959a---basewakuwi.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/44794016650.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_off0000c158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC158 18372 bytes
SHA-256: db36c1ad0544757b180e056d812fc1a92e98a942fd57cf911b51c14e45179c4b
font_01_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 10756 bytes
SHA-256: c1b25aa3780313ff1b0d370634ff03629d6e15d69b5a20c1f38ab1e72add1699
font_02_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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