Malicious PDF — malware analysis report

Static analysis result for SHA-256 092563cad2bbfed8…

MALICIOUS

PDF

72.3 KB Created: 2021-09-07 06:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c530cb846364550c39643bd1b59aa53 SHA-1: 7e8584fbde223912777b90bbc121452559b0119b SHA-256: 092563cad2bbfed8190afe083c6b04fe83fe8023c6392659250bb7c2fcea9c9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d5b3a4193---ronemaxasadepujeposowin.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/u9rdr96nqm42v4mk3bcuhtiopd/46234941930.pdf
    • https://anakaygame.com/calisma2/files/uploads/2891343671.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d7c132380a3f24d8961a821de32d3249/magoxirefogibina.pdf
    • http://hzqzg.com/d/files/4701257927.pdf
    • http://agendaalzheimer.org/files/galeria/files/vepabedarotekemolidek.pdf
    • http://studiopiergentili.it/userfiles/files/fupufotobuvigokilurabojo.pdf
    • http://fixafilm.se/userfiles/file/vuxuxaxete.pdf
    • http://automsystem.com/UploadFile/file/20210727012946417.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072849625444---mozekimovaxojumovupe.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/viteqacv1vogdrrkp4m8saipl1/61020978663.pdf
    • https://danfort.lv/userfiles/file/wenokirabafiw.pdf
    • http://jhdljz.com/userfiles/file/1626517801.pdf
    • http://52fotki.ru/ckfinder/userfiles/files/tarifirizekurepule.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/615caae1001f2fe7e91a0e24fd2ece9d/nibuw.pdf
    • http://dotacjedlaoze.pl/userfiles/file/13415259912.pdf
    • https://budgetparking.ca/admin/uploads/file/69930933561.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4553bab6b7f6a53a068536a52a4fb33b/rinaxalaxuxomorilezow.pdf
    • https://reformedgeneration.com/userfiles/file/sutazul.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/d685fd21ced787665f541d2634fd767c/semasuvelowizedokivazup.pdf
    • http://studiodispirito.it/userfiles/file/67826012315.pdf
    • https://vico-domrep.com/ckfinder/userfiles/files/86813661516.pdf
    • http://livilgirls.com/files/zolefeparebugunudidi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gifted+hands+by+ben+carson+download+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b949.bin
60d95db984e7ebdb3d318121fceea507dd8dcde62fe8dff2b5bfa2d4afd07450
pdf-font-stream PDF embedded font (sfnt) at offset 0xB949 11096 bytes
font_01_sfnt_off0000d2f6.bin
2a8d36bd83d671d88fea19170e78dd7497e11e2fdd1bda00535fe82e16a68c27
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F6 15760 bytes
font_02_sfnt_off0000fb81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 16792 bytes