Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a212d14fd77063…

MALICIOUS

PDF

82.4 KB Created: 2021-07-02 03:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 757c0626ae49a0fe722902f16524780f SHA-1: 3cd8279eccbc70d254b1317c10df764a0880e835 SHA-256: f6a212d14fd770632b2c3d4e66f1776578d929e07ec7055a41daa7079c0c4ef7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and heuristic firings strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://biosite.ru/images/news/file/vupizubiratafuv.pdf In PDF document text
    • http://iphysiology.ru/upload/tafigusomomafasoxujupu.pdfIn PDF document text
    • https://luminex.pl/upload/file/jusaxujebopixadefutuvip.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/92613582563.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/tozad.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/0sdoteb627ri0jlv9apthmk35b/nakurunuvareludu.pdfIn PDF document text
    • http://bjjiffy.com/upload/nidiwajowun.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ldme2ivdal85diutbc17suk04p/16910787822.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6e4bc148---1112913160.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160981b106c413---pexoxuwoxalakow.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b17399a08232b1fff0898d62ccfa14b7/wofevabetiluf.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4b08ab5135cb922da174d0185701fed6/ligonomoripulaxodinuma.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/6202106132.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/libufi.pdfIn PDF document text
    • http://alkanboya.com/files/file///geded.pdfIn PDF document text
    • http://tano-cable.com/d/files/merakotof.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/5894269518.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b256977e0---liwade.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9072bb343bde4d8920ff6f75d7c8900d/gurefolavaduzowumopiwavi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44aff2413a---82714366548.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/nr2r4afjvrkikcvlplrs458d82/zomuwazamolavojorevosaf.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bc5fb9bf5---pezezukevofivudiv.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3811be72b8---sogusojaxi.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/45ecebefab525f199c44a9b3fc1b135a/18357673898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=honda+8hp+outboard+owners+manualPDF 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_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 17928 bytes
SHA-256: a42d92c98b974630faffe009ac72ccca25e65f744b8b73384d8171a501f63ee6
font_01_sfnt_off000108fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 11088 bytes
SHA-256: 1639757f11fdf09ab8e85b0f9f7d2cb619837aef1119c85486a2443dd913f4f5
font_02_sfnt_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1