Malicious PDF — malware analysis report

Static analysis result for SHA-256 54aa9d0b37fbc43c…

MALICIOUS

PDF

77.7 KB Created: 2021-06-13 23:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d27ac11d4a4caf32df6e441b54b37eb5 SHA-1: 6b23dcc779d3dea96826fcf505a0da4b71466485 SHA-256: 54aa9d0b37fbc43c2522f8776844124d16c8ebed5e0de43d9fac62eb123f6b4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites, disguised as a lure for movie downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute malware or facilitate phishing. The embedded URLs and link farm heuristics point to a pattern of using compromised CMS uploads for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=avengers+endgame+full+movie+download+in+tamilrockers+in+tamil PDF link annotation
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d991599a7a---vozageke.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2b407659fef514201ced34f3c52edaa1/95482499111.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/cijprr30le87mjemcsqk8hsmsn/29660016348.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mvkkd4j1m91qcstivkrn55oart/nizutipixodobazexof.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/65c7d258fe79f5ac49dc4975ed4cb41e/6333344372.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/uceo6taq9u7l0eifqdio9kled2/vuvoxedizut.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210430043706181.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-30/20210530230133760164.pdfIn PDF document text
    • http://abnicum.com/files/file/96255568877.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcadf43df2---nuzanoromewifikujurop.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/c4gju44jck6kb6383h9o7f0amc/78283242730.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ho74vmnmntq7k0969unu6jau47/70149969713.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/72952739982.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/bt2u32nmi5q8ge2akcic84eav3/vomujujewalasolotawi.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/rtmvkh11lbmb0dsur4hi54qf8b/73262834651.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 5548 bytes
SHA-256: 96275379c9e32ffde0bac547a2d734a279d9d23a052a3acfc087e37abd2df12b
font_01_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 11492 bytes
SHA-256: 3f049b59c19abcce4c431f9827ac54e529f9160c85437d58b7bea90f21a939d3