Malicious PDF — malware analysis report

Static analysis result for SHA-256 9558dba478457507…

MALICIOUS

PDF

68.4 KB Created: 2021-09-30 19:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 997463e6e3e4caab934c8143d8e9e5c5 SHA-1: 6ad63c4d29de69af1f4cf77f56a04eb77471e280 SHA-256: 9558dba478457507c823ff7108064e1167e98f3195dcf0aac3ccd49083f18fae
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and heuristics indicate it's an image-based lure designed to trick users. It contains numerous links pointing to compromised CMS upload directories, suggesting it's part of a link farm used to host or redirect to malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6f7180482---8417096474.pdf In PDF document text
    • https://pacie.vn/web/uploads/files/voxavi.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161541e70232e5---jesixorumifinugotamej.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/36694509188.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/zisabixebimovek.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/fq9tse7ti1hlh2k666tj4m0ovm/jifajijawagigoja.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ptt7tfuqp60h19s1oguprt5t57/98286119885.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/66850435509.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/87935114077.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/wiwupunenili.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/kararosevogojet.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/94059333897.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/42070364238.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613018c7bdf4d---14270299238.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3fb11e187---lezefalumodawaduguj.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/37062453436.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210917020651.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/24180035351.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/xigototitipolagexa.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/zixix.pdfIn PDF document text
    • https://istanajp.net/contents/files/gafetejuviro.pdfIn PDF document text
    • https://hujanuang.com/contents/files/rewunanigivanelu.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/17253312268.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/62112782545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ispoofer+android+download+linkPDF 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_off0000aeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC703 10524 bytes
SHA-256: 91922fa397eec9bee6b6af7f352078c0e1a2171a7db6aa37e7dce4891c2cd098
font_02_sfnt_off0000df1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 14292 bytes
SHA-256: d218ec4954a0a70f2e493bf0903e3247dde4244e8772b1a62da2f6420562eb81