Malicious PDF — malware analysis report

Static analysis result for SHA-256 0514646d104580df…

MALICIOUS

PDF

76.7 KB Created: 2021-10-09 21:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 199ba7b67be1b7e3b65e949906d3a63e SHA-1: b7b5608d0fc5e794dcbda8641adb307b75aa9361 SHA-256: 0514646d104580dfde60f225e3351000eaf2ef3be3723aa6b4a64552c8618ab4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to lead users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of multiple PDF link farm heuristics further reinforces the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://marasintl.com/public/ckfinderuploads/files/fuwudaja.pdf In PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9941a40b3---902164919.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/gibatanidefibufodovaliwa.pdfIn PDF document text
    • https://terracell.info/images/file/9976337303.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/pebuvobaziribebiruwobizo.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/desejen.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/kofov.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/pulofixarelexuve.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/50473920417.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614014a3f1385---83797644063.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/47542339941.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/76463622406.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021100220331437751.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/dojaludarola.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/79947962275.pdfIn PDF document text
    • http://sakra.sk/storage/file/pezogujilerufulumopesur.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/60674ae1687dfc587df87bb79f9583cd/68892306807.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/58319340850.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615a8e4b40ad9---86402279160.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/5474064812.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/63885491143.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210920060116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=expansionary+fiscal+policy+tagalog+meaningPDF link annotation
    • 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_off0000c588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 11020 bytes
SHA-256: 58901927df3b1195618d188c6117fa0c46ffd6f7c227227abc086c50e2c08ba0
font_02_sfnt_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 18132 bytes
SHA-256: 862fdb54d421191042e77f4f951c20ac93744f07d4439fffc87bfbbadc598b4b