Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ebf88f2fd741132…

MALICIOUS

PDF

94.1 KB Created: 2021-07-05 18:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4c307fc77068a1f93867446adca6e028 SHA-1: 3e6b4a6a199931ecd37e205c1d1a345b7ff7fa81 SHA-256: 2ebf88f2fd7411322083314f866e040a563b4f6c9bc04a7befe366002c5ccb74
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://combrooncom.com/contents//files/73925454564.pdf, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://combrooncom.com/contents//files/73925454564.pdf In PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/22273874251.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb16e7511---5696733075.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/zovikar.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d36d4786bb---93408834084.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084fbf281143---20237981231.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/7119287931.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/47621100895.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/521ebd017655e72358c3c1a81a4300dc/30586472588.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/97582057134.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/34385498393.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4abdaf7ed1474f0d4b76db8e06afcca6/70117363610.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084f63574ae4---60898700006.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb0ec55e2b.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/92747180763.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/krgje2a1jjl6dbk04csen0a0u7/sokanubep.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vn01ctmoch69komelbslp32g0o/94469976425.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6f794de76f02ca0ba533ec244338aa6c/poxagarokikewobegebiwaro.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/5a24a4754b936fd8439d5b8709de35ce/kidox.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/58706375002.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c2b1de280ecb8dc9f7ea7bdc719c79a6/pugunowesojeni.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/rupexifanotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ayesha+curry+red+table+talkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 18956 bytes
SHA-256: 6c2b00c2a1acbacac05cbb095cc25442d8cb412e2e4eb0f4f36cc17243b634fc
font_01_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 16324 bytes
SHA-256: 7e728015a098442d86fbbc5886967c81df0e90044be9eb9029c06ec7baa1416e
font_02_sfnt_off00013901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13901 10580 bytes
SHA-256: d8e8537f8112ffb97be425fe18d64674c7447c2a6e491dbc4c1f4e911ee9465b
font_03_sfnt_off00015163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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