Malicious PDF — malware analysis report

Static analysis result for SHA-256 893efade9f023ffb…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 03:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e6cb304ec7c1affc421e56618834d45c SHA-1: f1e4a1d742b1fcb4285a81dc3f31c8a138655ac4 SHA-256: 893efade9f023ffbe882ca02290519332cb385429133579efbf85074083d51c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The document body is unreadable, but the heuristics strongly indicate a malicious intent to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ketchas.ru/uplcv?utm_term=microbiological+methods+pdf PDF link annotation
    • http://dailyliving.nl/ckfinder/userfiles/files/49020608927.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f2e8487725cfcef498286d3017ea39a1/wezivosilalo.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/fokap.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/40546397270.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a820ca0b521---83608202063.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/72751387792.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c354e184ee8---gemujemujebipumepojik.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/f7f534a54efb6365b1b89f1995bdbff5/30931482221.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/89793929986.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/ruwizazodon.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e97bf27777a---36389104356.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/kafunuk.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/kipodexotuma.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf6529635---73407761458.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/nidewexoxot.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/wesata.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/13404333628.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0243f012c0---rujugawolikibijo.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/5753f67d41b0ac41302eb17ee821e39a/68063481948.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/mai440de7u0kljp7flmore7q52/70667969519.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/56356283218.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9dfea9431b5d0945c1c66403559e26a8/38342802876.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/36392348323.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_off0000cc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 17596 bytes
SHA-256: 10e1c26923019d4e63b9ec62abf8a2a9493da8fb499e3e00ee1c8979a614e123
font_02_sfnt_off00011224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11224 11096 bytes
SHA-256: 7dc37532cfd6744c32df7c6101156712d6183d50b9d82f9793522e7ed0c2c23f

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