Malicious PDF — malware analysis report

Static analysis result for SHA-256 328cd31a1e279bdf…

MALICIOUS

PDF

70.9 KB Created: 2021-09-23 22:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83c73556157fce55e3df6acb66b23457 SHA-1: 419ba4e689afa7b450d354c535a20afcec25ed6a SHA-256: 328cd31a1e279bdf9d885c1b021f1e201efe02abab51cc6d4ef4657ebcba04c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve to obscure the ultimate destination, which is probably a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161326d0dbf514---5588942734.pdf In PDF document text
    • http://westernmaki.com/uploads/files/25428469820.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/sesojelupipuxonurasovipa.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/55703635235.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/biruzejobonaxi.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/jasojimopaxabojokelatitat.pdfIn PDF document text
    • http://storemisr.com/uploads/files/vijebowevin.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/bevazadojuxabudexalewiz.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/44505603904.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/jilum.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416fdef34a7---waloguxurov.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/12739681875.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/livelexepu.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/53359037323.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/99816208616.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/13926678681.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/vakagonudogegovi.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/wexojutosux.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/tasovefejabozefivirupipo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/78595773d51de46bd05639489926d046/22962110095.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/gutevagalulidata.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/samimadalatigesaba.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/nujibemadenijosotuna.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/82101010504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=below+her+mouth+movie+online+free+hdPDF 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_off0000b36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB85 10592 bytes
SHA-256: 3576efd813b9778c49971be3a0e373b4c3419b05d15a4dda9e04177d8280cf14
font_02_sfnt_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 15972 bytes
SHA-256: c690ca2ab6cf018a10e985bd4de8ff43a79aeefa174c1c2511b680e17b15378f

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