Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c9b89b12b51d1c…

MALICIOUS

PDF

84.3 KB Created: 2021-06-27 01:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 99fcce6c250caa97fd8f569c6b4f3617 SHA-1: 5f3227d6ad38e56ff85e199dd6898cb79aaa7706 SHA-256: 30c9b89b12b51d1cbd335d650300d5733aac9819b32ce41c1a85d0f8070658fa
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, a technique often used to host malicious files or redirect users to phishing sites. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it with high confidence. The presence of a link farm on disposable hosting further supports a malicious intent, likely for phishing or distributing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/bfdcc6164b3ec0c6b3355dc148f5f169/97415868578.pdf In PDF document text
    • http://swaminarayangm.org/userfiles/file/dibixeputisaxaso.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160760d3189e9c---12529064731.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/xifuwe.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e97fbecb15---5425004355.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/ruvebojowetelawoki.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3258d68a955548a276ed51e588ae9d3f/9848942672.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7004b34663---vuzatitidezenolikowotetaj.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/nugiworexozevan.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/42991918447.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609062703ebd6---xoduruvaweteniterenebenu.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/94991722012.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4e74306a5881d5e95341193f5a989ccd/79925458569.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/34740642375.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/4682d2287b9d63ae9efa95d76271c2d2/27019587275.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/jikofeki.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607429ee7ec57---beruve.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/kosekefob.pdfIn PDF document text
    • https://alajuusa.eemedia/contents/file/takitivajor.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210531050343.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/58336376908.pdfIn PDF document text
    • http://allycatering.com/userfiles/mufuvumuxubavopelidogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=arteries+carry+oxygenated+blood+exceptPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 16344 bytes
SHA-256: 0df2eb4ae12ae2bf6000460ae86d3abb15dea5f06f803d7c302f5e889e3497ef
font_01_sfnt_off00011252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11252 11024 bytes
SHA-256: 401847be47a3d3304ffbb292572079a7af69e10c6e704c06f93a6dfceb2fd587
font_02_sfnt_off00012bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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