Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead89a9421e9d30d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 17:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a91b76b023be4b3f85d11ea40a10543c SHA-1: e22f621c80c52ea3ffd25be9e6bd88edc3a2c81f SHA-256: ead89a9421e9d30db5123705d8de29ebb390a34c345df5a9f8003d0cd95c09ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. Heuristics indicate it functions as a link farm, pointing to multiple potentially compromised websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://swaving-stalinrichting.nl/ckfinder/userfiles/files/13320881325.pdf In PDF document text
    • http://caytrong.vn/Images_upload/files/96023651366.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/tigiligesifos.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/98740441117.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c820ec5c0d---mazotetugozivof.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613005cbc66b2---87198026178.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/fapiwisasuten.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/dirokufizopavasatute.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b569e5ce---morupiluraxisidunegol.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/99825114937.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae962f024a---38100835248.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/pokotereb.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/xivij.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/99630001390.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/mazojiro.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/derapatovadivirosinuta.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/ditezi.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/nipixivomasinivoteba.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/85555619121.pdfIn PDF document text
    • https://okazionche.com/files/15906637595.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/94003820410.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/zififilokorovuvulipuz.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/60990516291.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/kukalawazanezegefenokoxu.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/8934143201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=family+island+farm+game+adventure+modPDF 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_off0000cc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC13 10952 bytes
SHA-256: aa8249d3f4c84716227fe373b0f27b60317bce2bf40d5e88ea4c5b6245260b8e
font_01_sfnt_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 17488 bytes
SHA-256: 42071b0eb6b32467ab347076c9e976068c01bcb7fb2396f31378266dc2a047cb
font_02_sfnt_off00011268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A79 16840 bytes
SHA-256: 637f282a09958e0217b626fc4698b4d72005eb4dad7007e6f209d5e5c10a4ef2

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