Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a20b4fc29f160cf…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 20:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3988d7c821071f7d4cd2a4d423005617 SHA-1: 1355c4d0e76de7c52af72b5a6d96f75267dec834 SHA-256: 3a20b4fc29f160cfc6edb874eacd9d14cadbc060fe0460c62899a4f1d7732ddb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This pattern suggests a multi-stage redirection designed to obscure the ultimate malicious destination, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3f3bcc753---titozewekedivirudesejexe.pdf In PDF document text
    • http://selfmadefilms.nl/userfiles/files/telitisuzinowivaviwunirej.pdfIn PDF document text
    • http://wamer.org/userfiles/file/55989353376.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/57acccff6fca2cb16146bb0eb30613b4/47563201680.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/67166840366.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/56937481254.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/j0cbug1b3fn8tu2dd45gc076ap/32111554365.pdfIn PDF document text
    • http://belv.ru/userfiles/file/xujizipejewetikowabopozin.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/peloneme.pdfIn PDF document text
    • http://gyobel.it/public/file/foxuligadeli.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/1c3c2aa352140e2ab07eeb402051772d/tazalelaxusukomiretegeled.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210820231216_138773903.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/71952036114.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/67754310583.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8bbcfad7bc2994938cff44b6c9e6ae5f/95082893353.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c3a1905f4---28427311488.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/somumikawutupofijogoxa.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/6023285415.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/nikomudigelod.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e06a18a870---wipafonejedus.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/texefukomifewonexata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=did+justin+foley+know+he+had+aidsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/fd77bd657308b37424c14b527c19c49d/batapele.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_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 10872 bytes
SHA-256: 965950fcb9cc14b17d88fc32c50d6e709523b079547789b63c43fe05c21f364d
font_01_sfnt_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F95 18404 bytes
SHA-256: 5d956745025f70e9f297b220b7c3a2eb2e129106e46a67929a44376c7ea7d530

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