Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc16f5992cd4b343…

MALICIOUS

PDF

77.2 KB Created: 2021-09-21 17:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 297b312d9c6c8074eb55946a5b763b31 SHA-1: 1c938e241962572bf0793bf0b1f75214172a8257 SHA-256: bc16f5992cd4b343cc351e5eb3023ea155b7b3585e5c7af14cc73caea24728c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which are identified as compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=super+backup+pro+apk+download PDF link annotation
    • https://wroclaw-effatha.pl/grafiki/file/33251214996.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/zatirowokomovidopi.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/61843591890.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/kixibo.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146bcd49accc---nanefama.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/fukarulujulijowubik.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/67715286133.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/95896758484.pdfIn PDF document text
    • http://stattus.com/assets/file/27983135569.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/tugarumu.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/naxikozelozagop.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/wetapematobaf.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/52316742323.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614495545d4ff---22135073033.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/porigon.pdfIn PDF document text
    • https://hgb.se/filer/file/78497937024.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/sanezivagom.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613647c04e48e---bizaboveto.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/54077232522.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/39766908421.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/bifozu.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/38193804738.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/vidafixopademoxaxomopiw.pdfIn PDF document text
    • https://datajournonepal.org/files/44796882145.pdfIn 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://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_off0000c833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 10644 bytes
SHA-256: e6c3938ef1a9626118ee36799367d8582c7576223fcfe101b50eda8f1b940866
font_01_sfnt_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 18112 bytes
SHA-256: 379f7b7595c20d98b2838610c5428eacf0afb5ef5d219de586a0d0773fd02291
font_02_sfnt_off00010f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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