Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaeb377901012afd…

MALICIOUS

PDF

96.0 KB Created: 2021-09-04 03:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d24ea7bd1f8cb9cbf8191b75cc3a2e02 SHA-1: aa14c643f15d773673a95a9b5e365bf9cbc874f9 SHA-256: eaeb377901012afd44a03c37a0ef32767d92213a257e8ee58ee1c5e06b4a7152
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 link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting malicious files. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support its malicious nature. The embedded JavaScript likely serves to initiate the download or redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749ec6d5cca---27659495232.pdf In PDF document text
    • http://zkojicin.cz/userfiles/file/farijoridenekese.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/512c4d4bef267f4c42b8b2f0c9be6896/nixebujepexunul.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/3734222051.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/26574818468.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/gufasitomenujijusibigese.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/leserapiru.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/45947783575.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/faloliverakava.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/1h7v2bj9o6pva2ddbm446kusg9/pizubofip.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/19357398970.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/ranozogoramofabenasox.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ebc2d42f---pupimi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1df99086ae---jevibuwilupabugid.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/tutikosilirogiv.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/37076085987.pdfIn PDF document text
    • http://cpviettin.com/upload/files/xokemexomixupajo.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/51206457390.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f786099aa6b---77240921627.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/535a3a842e50cf641293abe3daf33abb/ruwetolabeb.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/b5a1loggu6mrjs585rkrdk5g0e/91502488469.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e9953af36dc2067def3cac8a97c636c5/tovitusago.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a983dd8b722---mimiwefewulez.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d007fcac69---61875583237.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b821ea7f6---muponezig.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/607250541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=rhesus+negative+in+pregnancy+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013c23.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13C23 17940 bytes
SHA-256: 4ffc520569ffa6b50e24e28b9886448b6261113f3509de0eb77e742eb9c8fd3b
font_00_sfnt_off0000f5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E05 17880 bytes
SHA-256: 908cca27e3a21b4be24beadb5d937df426c580cdca1a959fd83354dc37800094
font_03_sfnt_off00015820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15820 11056 bytes
SHA-256: fc1231dc57c2677b48da750ddcf93905ccc4e2102f4f91d411f55c97d798cba9

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