Malicious PDF — malware analysis report

Static analysis result for SHA-256 927418d2260b10b9…

MALICIOUS

PDF

93.6 KB Created: 2021-08-01 23:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8549c719e08318b02ad6a3fb8e11978a SHA-1: d61b52f9cd708a22c19263b6eecd3947082f1d57 SHA-256: 927418d2260b10b9bfb388f0d6836bd65316e7be23d449216b7ffcacbdf1659e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=how+do+you+cook+al+dente+pasta
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/69107386177.pdf
    • http://foto-klub.dk/userfiles/file/59276120912.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea066826d0---petefetiwu.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/fe0239a3eb18adeac7ca06ca22128631/gilosiguwixesomagefodup.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949c19b93fa---42513983792.pdf
    • https://alnahamgroup.com/userfiles/file/mozututozerevaxag.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e268198690---totutoka.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d99844b00---pokeduzugexeliv.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/95548677246.pdf
    • http://cs-golfclub.com/ckupload/files/93212817351.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd4e995851---46910861334.pdf
    • http://lesen-und-schenken.de/userfiles/files/5814076498.pdf
    • http://toitureetfacade.fr/data/Files/50775256542.pdf
    • http://www.dilipprabhavalkar.com/images/file/29917303835.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a9e400f3a48c94e450fd6343d66ff588/vazosula.pdf
    • https://efnnma.org/files/file/7270713846.pdf
    • https://carlojans.com/cms/file/tamewes.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/nukakobif.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c0abc24b5---zifom.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d5780c218---76103947866.pdf
    • http://valleypainclinic.org/userfiles/file/tanelutafujokisesojoziwaw.pdf
    • https://brahmagnanam.org/fck_uploads/file/52661239295.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/desogewupepif.pdf
    • http://extracam.es/app/webroot/arxius/file/bojapurolisorobil.pdf
    • 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_off00010a69.bin
20f86f0b8f0e004228a4845ddf28285f56b721be9b92073c8385ff9ee720d3c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A69 17212 bytes
font_01_sfnt_off000136f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136F1 16792 bytes
font_02_sfnt_off00014f08.bin
5503689f19536dffaa1b9842fd896fb51ade149df84815447ed41e701089d8e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F08 10696 bytes