Malicious PDF — malware analysis report

Static analysis result for SHA-256 77715db2ab1b01c5…

MALICIOUS

PDF

179.6 KB Created: 2021-10-14 01:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c7e82eba7db35329c6968a752b9b205a SHA-1: 3a6491e6d378680def7077f7f2c854e10cb2358f SHA-256: 77715db2ab1b01c5e5ac7ed5a4e74abb718bf549781bc74048c54822b3d1968d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing to multiple external URLs, with several hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://apra.pl/files/file/31596335686.pdf In PDF document text
    • http://h-n-s.net/userfiles/file/29030571959.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/rezim.pdfIn PDF document text
    • https://phnews.ro/files/file/21783965967.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/n1n3a1t1v78s20qiipvm9vrdo6/ponexaz.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615889423c978---barozekimize.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/natawekijodanetuna.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160223b0d471---59165154885.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/xivanilemagukojo.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc5ad6f21b---nizazagabimomefan.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/64644773555.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/jozivunozedefajulipejeket.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614743e33218b---45542469761.pdfIn PDF document text
    • http://firegallery.ru/img/upload/61936205880.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/77028879995.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/14270796884.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5422akidm1cdgdjuq3udcc8h87/72437733228.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/vonimi.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/20bc7ed99852b2bd56634e30d4002122/kikor.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202110130155328897.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/7187461129.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614488d30989c---9568088079.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=andronicus+and+junia+in+the+biblePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23AAA 10820 bytes
SHA-256: 3193deab95637bc39add2bb6e4fab406f9808e1e7b10961fc030d883722d6547
font_01_sfnt_off00025389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00026b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26B9A 16168 bytes
SHA-256: 6cba6677bde0f241d5abe4bd1daabf497e221bd6197b657de4268e87bbbbfee9
font_03_sfnt_off00028138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28138 24968 bytes
SHA-256: a44a69caeb5cf49c2b89058056e29d8ebb2ca7f7a3ea2ef542a579a733510c16

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