Malicious PDF — malware analysis report

Static analysis result for SHA-256 010fa606ea803580…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 21:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f983050f711a9f81302e0c5641c82782 SHA-1: d763071ee08122ed8bdbf67f1a39546ecb9866ed SHA-256: 010fa606ea803580dcea10b6cdb1e4c4c43ab2333dee2e06665fe534d16b62b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The numerous extracted URLs, including those pointing to compromised CMS uploads and link farms on disposable hosting, suggest a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=turbo+expander+compressor+pdf PDF link annotation
    • https://noriupapildu.lt/ckfinder/userfiles/files/4113037599.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/81969034312.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/18929311545.pdfIn PDF document text
    • https://efnnma.org/files/file/66518836251.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b819fbe3f7a---25612874318.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/42236622314.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/palaluveboz.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f21fc5b0a---82095356954.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/4t8r4o3o4ogr245rp8669cq582/vazag.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/rikavanunoxekisajidunoxu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccea5e2025---bavupevosix.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/wotirepirivibigedemanibu.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/b0f2e31b79ae19290970b4e7d10a1b43/25767403057.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/76992762620.pdfIn PDF document text
    • http://ha-sine.com/d/files/pesasotujoxudawapeladegev.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/4c773f7bfbcb40f670cbf1b6a6ac8e8e/medululebafuvumuva.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a5f6f24cc---luzulugozozutikeve.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/majugusamekinudurix.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160997b83d8891---47607178367.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/be823db4894963148368971439fdfc9b/xuvimagavekekidomew.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/59537873622.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/49030376098.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/42098215602.pdfIn PDF document text
    • http://winso.tw/userfiles/file/jutivexoxese.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_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 10848 bytes
SHA-256: 67e606b493803b5f360454f4c9fa21cdfca1632b3ec2c12aaaf5883a64bbdac0
font_02_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 17924 bytes
SHA-256: 7654433ff060b310a4c85a4b772eb35dbe18a642619e0340ba95b64c8ccb44c6

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