Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b50e73f5cee9d3…

MALICIOUS

PDF

80.4 KB Created: 2021-06-09 17:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 45492e44367a0719a60c8c7f28113f99 SHA-1: 9b2966be96167d1e70d210f7971d233156b6714d SHA-256: 91b50e73f5cee9d312fe30f94d759ee4736f78dd3e41c077a2477ac464d893c1
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a 'download' lure further supports this. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=kyte+tv+apk PDF link annotation
    • http://apcmagon.com/userfiles/bavagipuninukudubejole.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/lekevukofokugesiburi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/fcdf2b24ffb2777a97446e4d498d6262/gijagoviv.pdfIn PDF document text
    • http://caramelitos.sk/files/93964717031.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b35881b374---zivupedamexisavebowog.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/diwexaxutiwikilixanemub.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82900ee66---3240789050.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/eb34c67fd8f86b97b0344e9c3c493714/16079512672.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a03f497cecd---97959767918.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb56ee0e34---75588312958.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d273e43038---rimosigujelemuposafa.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070700f5a79b---9998255365.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5959d2a08b42b40c5d1236edc7707011/74035768436.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/30p00e1kb18ededjh2cfqa9nfi/28367802031.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2eb4ee3062---rogegodakozelaxefikib.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57ff130b2---89654323293.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/nigosopigumopetokaxuson.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 4228 bytes
SHA-256: 47c059ff42db0387bfaf0f1d81a3806bd668c0abb87edac3a333c57f4bb56207
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 11012 bytes
SHA-256: f5054ae8ea86d04d73acbf5bff19720567413e212a3a115211a7d1ba1b896448
font_02_sfnt_off000125d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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