Malicious PDF — malware analysis report

Static analysis result for SHA-256 a349315c6b6f08f3…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 22:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c212f895a4ef7caf1cbc6db5e7991bf7 SHA-1: 86fc68cc2a20f3f55356f62ab4d718eba1c004fe SHA-256: a349315c6b6f08f31a71623141c77a20da86fd4b9121e7679f391e765dd5d267
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=flutter+using+java PDF link annotation
    • http://a-mega.ua/images/uploads/file/naxekimezujewozopejuxag.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/30537320277.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/59948718821.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16133984093050---49973359642.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340d4659bb4---gibomijagilipatinokuli.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146883b6403b---20581104220.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/viwawupeni.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfd0fe71c8---93390532372.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613def64383e3---91028310145.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/18313320245.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/zezezovaludogesixovo.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/puzudulabijewopepigiraji.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/57692753222.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161379b0521d5c---14295488210.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/rurimanejuzu.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/wetowoxema.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/polijab.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cc0313d89---76631727823.pdfIn PDF document text
    • http://polkovnik.su/upload/file/79908093937.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/33438167424.pdfIn PDF document text
    • https://tkbhanna.com/ckfinder/userfiles/files/68238243270.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/fawuvakanijisafipatij.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/32094159448.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_off0000e22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 10436 bytes
SHA-256: 16017fc76704d09206bc3f4a44de58a5e48aff79b998a4005d888b9a1528b8d5
font_02_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 18400 bytes
SHA-256: c64ab180f1207f7bafd064353ef71e2a24d21a156a599689e4cbf04cd138397d

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