Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad8c6c42f4934de…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 09:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 402d7db15b06821224c09c4be7801092 SHA-1: 63f7bb0cc2dcff364f9d0f0bff22d43b2816aba2 SHA-256: 7ad8c6c42f4934decafc9bfce686ff38cd7fe72fc26991b8dbd8447bc3691f10
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These URLs likely serve as a link farm to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=the+liver+produces+urea+to PDF link annotation
    • http://cgemfoco.com.br/ckfinder/userfiles/files/54573974181.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/49b96900ecdfb1d6b9ac7400ef6420ff/tixadisabijogoximojobovuf.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/80e37397a4b5c59f5de537b6da6679d2/gajetukitim.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f263c6d62---26140265593.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/xujev.pdfIn PDF document text
    • http://aweibel.com/Photo/file/63248046997.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/53173757543.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/pomujujilowupika.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/67563133198.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5adb9113b---bejowakupojunajubos.pdfIn PDF document text
    • http://fruitvita.com/files/files/12899738750.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5211b10ca---45400839574.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/nizapiratevibutemodavuf.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ae17a9b928c1e60917e99727751ded8e/4480605841.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/wizupifiv.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/wufarokasevoledov.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/434e9b9518618624d2ca463bd75b0a63/wonesepubajor.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/99631988413.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/bividitute.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75f96713d---dinuzorejoduperejuger.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/5361193032.pdfIn PDF document text
    • https://12shio3.com/contents//files/siboxi.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/86974904622.pdfIn PDF document text
    • 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_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 18428 bytes
SHA-256: 89c13165f8ec902f5912422032e699c2fa48bc6f5489447956162d94ef1b49d2
font_02_sfnt_off00012c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C34 10636 bytes
SHA-256: d6e216affb3cff5344c94c7a2993edaed1ab742e8fac57b87b303ab2fb1ec549

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