Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d79555eeb8f922…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 12:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ae16fd1507d0528efc32ecd6970b06d SHA-1: 9c43d80573a7a3f4009fcfa2c70c799f745f04c0 SHA-256: c9d79555eeb8f92240e4fe219aff995396fb62aa7f0ce6a2626ed23fc662f5b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of URLs, many of which point to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of UTM parameters in one URL indicate an effort to disguise the malicious links. The embedded JavaScript likely facilitates the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://chcial.ru/uplcv?utm_term=download+hot+coffee+mod+gta+sa+android PDF link annotation
    • http://ondrejkocar.cz/img/file/sikekanimixuwub.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/73918155074.pdfIn PDF document text
    • http://becucci.it/userfiles/files/fitenitamuduj.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/56509020379.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///64172230681.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3ef2ec34c46732262bca9a8d6b5451f7/fupadapigorewela.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/s68ab5f11mdk8s3khq6ebcu8jc/pupevomowakolugarojiza.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/79109563493.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/69478939117.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/mme4gais5cjlsgftpgj7j8to5q/20576943253.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/fosubofapul.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/tudepozaxamagopemegu.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/sonisukizo.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/85777363894.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/worokep.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/suvotexor.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/92140730810.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/mebibosuzarevowativani.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/2450135716.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210908123828.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/45766338129.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/2938128743.pdfIn PDF document text
    • http://sinners-party.de/media/file/85133098680.pdfIn PDF document text
    • http://mega.kz/media/upload/files/13183088968.pdfIn PDF document text
    • http://chipgene.com/image/files/20210902_055858.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161373b783c319---sujusozirerafubadaw.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_off0000cfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCB 11008 bytes
SHA-256: bbbf1f74a67608c832ca47c7e45724b1b8db395b70aa00d01e632fb63c320632
font_01_sfnt_off0000e903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 19516 bytes
SHA-256: a9c4044143fa6de6c94149f2136f698caaed6cad244ed752f77b75980613fa5c
font_02_sfnt_off00011c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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