Malicious PDF — malware analysis report

Static analysis result for SHA-256 f742fd38f8836bee…

MALICIOUS

PDF

67.1 KB Created: 2021-09-13 00:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6927ba3d21286e8389f1e1de5a6b9489 SHA-1: 55d6cb3316189cac779a3a72a63738ca22efdc5f SHA-256: f742fd38f8836bee5a4cfd952a55633492f98799f8c8731c95c8607b826c7d00
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The 'PDF_IMAGE_LURE' heuristic indicates it's likely an image-based document with a hidden clickable action, a common tactic for phishing or malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious, reinforcing the phishing and potential malware delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=bigo+live+mod+apk+2020 PDF link annotation
    • https://vhcvietnam.vn/ckeditor/images/files/80053208355.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161337195148d1---7754252470.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d4a5c072---74541555254.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/pebokedomuwejomasofudus.pdfIn PDF document text
    • http://armanetti.com/images/21405617791.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66b102cfb---xosataxefofegetopufikipe.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/95041743561.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/vafagovoviw.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/31248740403.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/38262812307.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/40841154740.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/8269185452.pdfIn PDF document text
    • http://mobiliteit.nu/files/61112628005.pdfIn PDF document text
    • https://rotitelor.com/contents/files/34727995446.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/61729464909.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/40745084288.pdfIn PDF document text
    • http://rc-modeller.se/images/file///61462690272.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/55201978692.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/58101621656.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/vozemurivegajibijigukoto.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/durixesajevidelasidoboruw.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC09 14124 bytes
SHA-256: 575d4c693681222576260fb979a2360081472d69f606b90f4882ae15cbcff198
font_01_sfnt_off0000ceda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F1 10720 bytes
SHA-256: 777ccd221cd6553243bf00818995cd64dc036f54c65c532d3abb81bdc0c3a3ee

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