Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ace7e99e532be2…

MALICIOUS

PDF

82.9 KB Created: 2021-06-28 14:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7c6083ab54d4b12d4bc060994762f4f4 SHA-1: 1966da39ed90b6fe18a9749e51f73a4dfae4f830 SHA-256: a9ace7e99e532be2eb87674a689f12b4dbea4993dc45a1157d278ff6395b2a05
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and link farms, indicating a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://4bzsoftware.com/Images_upload/files/68718277950.pdf In PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071ab655624d---22353724523.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16070eb35ca98f---94457378952.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2bdc5a19a---27204209096.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/0340b96a451ed2cba541c34fd9c8b255/wakobe.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab0049f57---62623252851.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ce35b678---67974358204.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-29/20210429083230775164.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e8a0e7f97---garovazafobagipowewus.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/56024469270.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609620e8756d4---xirepinemimapojure.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ec90781cf72b9409cbc33e8564034a9f/medowuluditaxafu.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/pixikeripezogavejilines.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/bavupigugelojajasu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abae1f00819---69095776995.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/pabejog.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/gij4nnuv0vnbr9j42eaij8abii/mukuwelikoj.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/wojoto.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c296ff8a581---94260809615.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/18a858ece6f2f862937ea7c5f18b97c7/49138139579.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e3e0fb49---50396423039.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/jirovulaxore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fortran+data+structuresPDF 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_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 10300 bytes
SHA-256: cf9765be7f9bdc8a12c956d045908aa007efca79a84aeae66776f5d46f714907
font_01_sfnt_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 17980 bytes
SHA-256: aa3ce7819196dd319a6533aa4ccc5c15314f28838a659a2d121239ae747a4c3a
font_02_sfnt_off00012681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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