Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3f638a6adba2f2…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 19:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b66532766f9e4b7c56aa0d7edb104e65 SHA-1: 60c137379088d6629ce37f78b6d4d48a5946ebff SHA-256: 8b3f638a6adba2f2abeba0a9f389a50aef346b16fc3429a29a93bf3c9f4cb4ec
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters. Numerous URLs are present, many pointing to compromised CMS uploads or disposable hosting, suggesting a distribution network for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://qtjdb.com/UploadFile/2021/08/08/file/20210808_023323_133.pdf In PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/93376316599.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/fidarukes.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/3iamaisuj4lkab0jfn7gnvnui4/7467571293.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d38a485ac---mujopevo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a83e82ef13d---bobukegididopoje.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106210920235016.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/16946827728.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/vblrtbtilq6dn7mocdshlv1320/tizobokumitot.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/100aef92e793ed9d0003871cbcc0f8ad/92460430559.pdfIn PDF document text
    • http://suara.ru/img/file/legerewurimatuzomabulob.pdfIn PDF document text
    • http://tipiland.net/upload/file/833803461.pdfIn PDF document text
    • https://digireg.sk/upload/4487814832.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c4216eb0e---pireverobejigavaburagefep.pdfIn PDF document text
    • http://naviway.su/upload/files/74273123853.pdfIn PDF document text
    • http://candientuvibra.com/images/file/tevox.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/4hh244q83up3ojdh8triqu6bil/runuvavetazuwu.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/sofudavekopifabukew.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/gewajexujoviw.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983fe03ff4d---67330875735.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/64376691327.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/03595c5692b70ff360923bdd284a6927/vokegigezejividi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609065570e9af---vibapotitidowawuba.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f139693e787---gekowis.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/mivopinalitu.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/gefegapenolagitumuzixajuv.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/nesawotetutaviwiwazadu.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/95076062287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=como+unir+pdf+en+un+solo+documento+gratisPDF 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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 11092 bytes
SHA-256: 74f5a15696b1919eaed58f6185f776d4de1e7779a6efc30fbbc43a2c9edcf8ce
font_01_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FE 18456 bytes
SHA-256: f209978d56e957276d480e151ffec2d56b68aada05382705493da86d51a1a5b9

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