Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a449c0e5e929ac…

MALICIOUS

PDF

79.6 KB Created: 2021-07-24 02:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: eacae3566465f361f02fd2aff443dacf SHA-1: 99bf3bf4734443f50b6d4ee17a295353e893b644 SHA-256: a9a449c0e5e929ac256b88e61baca2137ecf4bb1511d4828bf6497fb6d3522ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/imadv2enp16h8uhkgqdtah7juo/63338136977.pdf In PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5ba1f0a8a---5696476720.pdfIn PDF document text
    • https://songhong.info/userfiles/file/7016741986.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160779b9315678---3840024566.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/teruboxatekexuginalive.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///kavejozenatokelum.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/43701975772.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/de51e3c13b3846c6db6b6d6831782b93/98616379027.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/rakeko.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/91d6d0fbf916cf3137e6deb6fc525899/gukavoxojigenetaxitinib.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/dc445fe580cdf6b44d3f3507278044a1/67350349652.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/tobuwinenopunexis.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/38417293010.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ki5kfv3l3v9m9856j0gdq5s6d0/bufarotojeru.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/59901450389.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/13574408798.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0d3395fbbc614975fb2aeb2e8d4394a9/siriteliwamivubuzakib.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/fukemaxejoliriz.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/65199405981.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3131f3517---zatuxareruvulo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/49cdb8d44966e5f57583f485eed1b9b6/20001786752.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9228d5b6e---37286085507.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/32419129869.pdfIn PDF document text
    • https://actor-conseil.com/files/file/sesediroxabafagixemag.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/etch57edbf3hlcd093vdh9rs30/83993620890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=emotional+intelligence+by+daniel+goleman+pdf+book+downloadPDF 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_off0000d03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 16796 bytes
SHA-256: 6cc5983449255868779fb119afce941d236642e99bf12a6037baaefb5f2033b8
font_02_sfnt_off000113db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DB 11112 bytes
SHA-256: 9dbe8531e5d220017b44fc756e73979b35ac4d2e7a2f3aa0832107c6528f595e