Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb22b604c1bbdb8d…

MALICIOUS

PDF

86.1 KB Created: 2021-09-18 17:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5879b5f0c34808d39a1ccc11a78e979b SHA-1: 1b32ff4c10195c93cc87c880221d70dee5e6aa65 SHA-256: bb22b604c1bbdb8dfc79533afe5e057bf8163524451618fbcd73e1a4450d4e25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://veterinariacasettamattei.it/userfiles/files/jiwukixiwakixenizutugow.pdf In PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/fifitapam.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/geukj41hcuq7ut7orr0ne2ef3s/52899362114.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/pexejo.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/20347724694.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/xoxagez.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/bevabiritalovoten.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/44739376745.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/mijexexitowen.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/pakexovafobotadirino.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613297b89b6d5---82545678447.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b80710c8aa---4222769903.pdfIn PDF document text
    • http://unseretochter.com/images/file/lutaxenafetil.pdfIn PDF document text
    • https://carlojans.com/cms/file/67263219677.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f73abcf8f4de1f9a9198fde5a5957bc4/49996754618.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/74730827630.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/zujeromoka.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/biwob.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-11/20210911030639225508.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/65622183160.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/xegafusalijuvorabiziru.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/ditoxurejosigokekogafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=clean+bathroom+escape+walkthroughPDF 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_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 17292 bytes
SHA-256: c31c9cf2a15a6a82329249eb80e9837fa2609851fd118aa2aca9b4652fea907f
font_01_sfnt_off00011904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11904 11180 bytes
SHA-256: cfd88e5f6d5b2862845116cf6ded702dea14223866f724ab57fa3a3acd90d47f
font_02_sfnt_off000132eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1