Malicious PDF — malware analysis report

Static analysis result for SHA-256 81814f832e59d022…

MALICIOUS

PDF

89.9 KB Created: 2021-07-01 12:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e72986c147c039d405b637a08667acbe SHA-1: bfb49e95d9e401280158735650a3ca74cd86396d SHA-256: 81814f832e59d022cdc04c62e24ee7de46cd6b582c553f6255b0b83ada1506a2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afd002b5736---duvataxolodug.pdf In PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0cda8f3bf---dozivuzupaleri.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf116254d---zigoparujux.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/231536323807.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/muturepewavokelowisabasu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c4701b02d---sapoxopizetilodovope.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607336bed949c---womugibeduvolalugupivaf.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/70618673920191fcd897640e0559055c/ketumotezatijefone.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/55df1e1ff3deaf00c227340a0a59c50d/xeparawunusumefoxe.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7462b5b196---63939936022.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fec451d1d3---89424433724.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/4254822186.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/90412345211.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092869315c4c---zijowo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/mjjce0kdtm183lg7loh6aup74f/merotojetuxijim.pdfIn PDF document text
    • https://efnnma.org/files/file/murasojuvuwasolazesewo.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/vazana.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809a80cfead---82661521473.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/5a083bd558475484e2eea937d1f3164f/werego.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/nowujiboxofipivebiletejoz.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/debofu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b1fc39646fe18bb12507fcf6e845179d/9768161318.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/494umg1lfr270m6lacvgdvo4r6/40081396681.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085d04655c1f---73733748014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=scanography+x+rayPDF 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_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 17384 bytes
SHA-256: 3cffeafbf3a099957bcb4b4817121b5f5d3d46e7e4597556e75f85311ee5fe61
font_01_sfnt_off00012af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF9 10408 bytes
SHA-256: 3630d379c548a4e8ddd48ada39bb8987c8d386ab0d802923e03beabe1520a363
font_02_sfnt_off00014285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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