Malicious PDF — malware analysis report

Static analysis result for SHA-256 da42391944df9249…

MALICIOUS

PDF

383.5 KB Created: 2021-07-23 20:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: dc67b69c56f9fe1c0d2274feaa5b7652 SHA-1: 8e74815688a5c3846075d9b65eeef718596cfbc6 SHA-256: da42391944df92491379132e3fef7efb4c3c2406e8a61243203951eb5de2bc4c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to solicit sensitive recovery secrets or private keys from the user. While no scripts were explicitly extracted, the presence of numerous embedded URLs, many pointing to compromised CMS upload storage, suggests a phishing or credential harvesting attempt. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6039

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/vggqbc5lmgp0qfe7pu8c2vkb64/63498962226.pdf In PDF document text
    • http://imssp.by/data/images/fxeditor/file/bexixakutonotozazin.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3cffe4ff64a29b71c4ccfe73b5b9cc60/kaxiviniwekirar.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c192d83a9eb---joxisuwozetosufinasogomuf.pdfIn PDF document text
    • http://inncredel.com/uploads/46343260129.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e583b741a5---28553092704.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/p2ediqj1a5l15i461dj2shn5n1/29737389091.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b51f3a937f---xozisarokeborow.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/mowuwoxogenax.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/weresurajokopojaxek.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5c8f3202---xokomifakuru.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe7ac9c374---14002943708.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/fifen.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/19222030089.pdfIn PDF document text
    • http://webbuilders.com/files/file/12867608235.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609523b59101d---xipuwegodefubawelakura.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecae4f0f69---zivamofavujumoleno.pdfIn PDF document text
    • http://staropolski.net/Upload/file/24027224030.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/lonavisoz.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/93bdc22d54533530af672e5cd122f943/56472221681.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/21b576111b1a7fe1f113d7dd28207edc/71428798005.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8380d77957a39bcd94a76f8edecac363/26380783101.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/63908150604.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/nilileboburafi.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/xorilojejez.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/80251796323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=exemple+de+diaporama+pour+oral+de+brevet+parcours+avenirPDF 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000501a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x501A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000519b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x519B2 18756 bytes
SHA-256: fc363da4bbc0e436309cc60c49706ba73254d0c525cb3ceac4f983a7d21da8d6
font_02_sfnt_off00053888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53888 952 bytes
SHA-256: dae4183dc2711b782d4e49f32eb31f8d875bcba6d465dd7c4c6a65a419ab3dd3
font_03_sfnt_off00053fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53FA3 18648 bytes
SHA-256: c652bd7f738ce2cf8b36e642a484688f5eb6ef5d1315b8a2f53e6254ce2ff4fb
font_04_sfnt_off000575d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x575D9 38324 bytes
SHA-256: b657e0c99d641311c57a197becca6761a8b95ab86ee08ed7a1244483e368eae0
font_05_sfnt_off0005d091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D091 11068 bytes
SHA-256: 563bcb4623912b22d7b8e3872716caa7045a801b44038a2106cd6fc57b6f67d2

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