Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d95711caf0373a…

MALICIOUS

PDF

89.9 KB Created: 2021-07-03 13:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec9489fd33a297d19ce560db29e6d181 SHA-1: 993726f414b98613f1749e4c95acedc291543169 SHA-256: 87d95711caf0373aecca400c3d2312e840f86621ab44e02c52c26d512934bdc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The PDF structure and link farm behavior indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608090b33abc4---koxuseg.pdf
    • http://teplospectr.ru/images/files/dutisexafatebesid.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f0f98e28ebc2014905b33195df690ae9/vegowonis.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/glombni42e4j32c3o93rjtlj0c/nowoziw.pdf
    • http://heyumpnd.com/userfiles/file///23405742101.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a09e54fbbade8d8df5098b2e0509b522/33136978088.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ad1d650b1---baravananewagalisoviwim.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/831314108861424f0d90d244129d396b/barelurodaxusuruta.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/1fd20e1c181058f00113e931c965fa2c/gabotipekulajabi.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d668e9d98---22333448763.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a73f026d5---jajisemema.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8422d9155---tizozok.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acab31e261d---96530866049.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5ed11c103caf2ea0e4b9e954edf5a06b/77154538342.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fddb06702---zewinipivoto.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0b1ec85b---36390039316.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/nnkf7gj368qgti9ou1h6plclkk/48564205728.pdf
    • https://iringmalaysia.com/ckfinder/userfiles/files/ropolodagadi.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dc6b5a4ea---vafidejitixixig.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/v8vr1nmvdsif1vacf76glqsbch/60749985660.pdf
    • http://hurtglass.pl/upload/file/69450265618.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076257219721---wegojap.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cf561581732699d1f6c046fe57c43c59/mogalilirati.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da2af81bdc3---48166088881.pdf
    • http://bright-mineral.com/uploadfile/file/2021051823364052.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=most+common+cause+of+gastrointestinal+disease
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD12 16792 bytes
font_01_sfnt_off00011529.bin
994fa2910eccdf013ab8ec5ce7207f328f7c106bc77e03e73489fc973c3881b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11529 10912 bytes
font_02_sfnt_off00012e32.bin
f2ce04965b42ece284a26e5a697e498f83cf4314b0022be238227c072bdd782b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E32 16828 bytes