Malicious PDF — malware analysis report

Static analysis result for SHA-256 403e674e7f8e058f…

MALICIOUS

PDF

89.1 KB Created: 2021-09-16 16:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11f084ff16b379df3efa9ea206ecde1a SHA-1: d6a13aae027edec195bcf82d636e58ea60b413cb SHA-256: 403e674e7f8e058fa6a2fe128fb12567d9ed257429de14840d86a3c74dddbbc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359f6f8414d---damigaditeg.pdf In PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/91133393348.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/44979701956.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/12827891250.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/gujelaxukuxikigup.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/laruzid.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/lokowanudunitiw.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/30970269480.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/94185173878.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/50096708490.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/99239951031.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/zonukazadinoziwebul.pdfIn PDF document text
    • http://186086.com/upload/files/wumarakibomavabisebutijim.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cab379d62a---37988493647.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/fodosalegijoxogevoxurug.pdfIn PDF document text
    • http://gaudi.tw/upload/files/13793075866.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/juvusoki.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429e7279a6a---pepavolupunamenesorumasap.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/19536868360.pdfIn PDF document text
    • http://makaroma.fr/upload/file/53378496949.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/nisawivupezoxedopo.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/11388791936.pdfIn PDF document text
    • https://ptogel2.com/contents/files/15370008070.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/51387417794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=iptv+links+m3u+url+playlistPDF 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_off0000ee4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 20748 bytes
SHA-256: cee58e9a401bcf86a1c4a4065498530bdbe30fba7b8233a4d135e39448c5d7f6
font_01_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBF 10656 bytes
SHA-256: aa53d6c518d03be4dc027cf0256b7e271973b38ec0a1a08b468e331a0d8f913f

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