Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c1efd8da84486f…

MALICIOUS

PDF

78.7 KB Created: 2021-10-14 22:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ac2193a5ee3e5fcac9809c48ff603f95 SHA-1: 6991238eb31c9ad8352ea1a1183b3816512c406f SHA-256: d8c1efd8da84486fd4036d3fa6ebe0592f78a55ab3274a02b8a3f10ff3304ef4
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 presence of multiple URLs pointing to compromised WordPress upload storage and link farms suggests an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://mwcapital.net/ckfinder/userfiles/files/sokowafurifavumo.pdf In PDF document text
    • https://adikkedua.com/contents/files/jexikirexir.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613576a10fd0a---zafisolaxek.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161517a3c7a4cb---65954225058.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/91339179013.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/zofifal.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/vavavesuvolep.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/15660280270.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/21196489835.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/87886465916.pdfIn PDF document text
    • http://bancodevida.com/bancodevida/admin/images/image/file/4302401026.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/17761459082.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161564d5a9c38a---96888961300.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/83077263156.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/55114582762.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1616675d5675d1---fepotimozavujofe.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3346f7f5---20926637627.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/zidiradelarepebop.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/sudikefiza.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/lamupumiwimumesunedevoju.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161309b1062fb7---77991131627.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/59590678772.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/kolilurikedujatutesil.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/maluvag.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/Z3ufxtS7Wvw/uplcv?utm_term=convert+1+gallon+to+litersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 10432 bytes
SHA-256: a1a901b9d59e432e906df2eb918daf109e26dcc0e723ecd9e8b04a92a1752d08
font_02_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 17396 bytes
SHA-256: 117a24bf17d9b96a961093fef8688cca242c74f21283c3c7bc5a1ff91fdce0f4