Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b23fa3c09ab0239…

MALICIOUS

PDF

88.3 KB Created: 2021-09-21 03:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89a64fbb4307b20e1dcdc9916e2cf29c SHA-1: 15689da684419cc55e28bac908fad8cc08867e6f SHA-256: 2b23fa3c09ab023925aee45255d299ad4b0a58ccb1034751479a84c3814a8f62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://nbnjl.com/userfiles/files/kitomalor.pdf In PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161436e9e4e5c2---gexirekoxegilexepifen.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/jekowizirof.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/zepup.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/6286653468.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/ponorapidodidal.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/fimeruriz.pdfIn PDF document text
    • https://timminsrenovations.ca/file/IVIgUiW876b1hUIQ.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/25039870203.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/30111307080.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/pivalofabakawari.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/womuvazimimesasi.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/mjbtnjekdtkiuuvag3vl5i1e24/89840672584.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/74769770114.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/8865363310.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/82020143292.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/vujidoduwezu.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/gezaligevo.pdfIn PDF document text
    • https://melz-feu.ru/upload/74775423891.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/50952054298.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/kujobafinutawuvetu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b45060ea---11197957004.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/xowanuziba.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/runolekagokulozojobixujaj.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/dewufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=land+use+planning+mapPDF 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_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 18176 bytes
SHA-256: cddf1e864e4c472fece2a469b26cab6405103501ec8f87774ed5f655f3d9d8bc
font_02_sfnt_off00013c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C70 10476 bytes
SHA-256: a20a7753984e503435ea064b8486078e4f66c3ebfac0ba2cc4f0219033175d86

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