Malicious PDF — malware analysis report

Static analysis result for SHA-256 5502b4ac411e0c61…

MALICIOUS

PDF

96.6 KB Created: 2021-08-27 21:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84458930bb40cc983d431023d0ef0393 SHA-1: 4bb19d60bb332a5b91ae9eaeb259725cbe544607 SHA-256: 5502b4ac411e0c61f430d70844bd152f10faacf99c8da3170b5d7e8318088079
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. It also features a link farm pointing to multiple compromised websites, likely intended to host phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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://smidgel.ru/uplcv?utm_term=2020+eamcet+exam+date PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/aa25c90b5add4822b69734aa7837938c/zizojozadoreboses.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/gujepipelujatu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610baad80015e---19312276688.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lexakatadefugugiki.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16090ba5dce748---gijomi.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607724f8c750b---14314883435.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/forafodemujizedazi.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/nonipuwevaw.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/detuzezusozidikaw.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/51933241050.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/papuloto.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/84095944128.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/junuwitesum.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad484b96e3---fonulazozerenutupa.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kidajowepanipabupanefe.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/xiwukegopufiliziralelukur.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/boxazimigipunepe.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2b4d3199f---zulevururenedutexufa.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608324006ba5a---pawigolodijemez.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/pedunixiwaluponap.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/42453943812.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/82627051093.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077172d8565c---livusefokanetekixigosiped.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_off000111cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DE 19796 bytes
SHA-256: b3454c70271a3757a713f921bbb1912043c10ce01f1421e394a7fe9ab75c4b08
font_02_sfnt_off00015da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA4 10148 bytes
SHA-256: 1d1bc1bdb060d1238ac18cd099dbefdcb4ea14daab0aeec44341434f44bdbc3a