Malicious PDF — malware analysis report

Static analysis result for SHA-256 e908ba0a5b5b3abe…

MALICIOUS

PDF

140.5 KB Created: 2021-06-28 05:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ab4fbaa52182dd15f108a2f88b11939a SHA-1: fa5851e955f7020f043a55bdf0d1598156b070f1 SHA-256: e908ba0a5b5b3abed1cb3a3b64f5eccc558ee562c510358758de1586c53d12db
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and numerous URLs suggest a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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 https://aneri12.eu/res/file/xesowiketisumatuj.pdf In PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/s584mrm9kcls9730nkq7j1bkma/melesiduziko.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/161649523648.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5878c4248---54978274235.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/jq049p9g87srs3c9fbbit2k6mv/juvepovu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607971d1a1951---zitorarifejuv.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4f9fca8ab48a318015c6bfb9514694b4/namokikaxazivoxawe.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3149bdf9---rojogewijevojivogiv.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd35e85f21---bopodujokafofotovopo.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ba504fc999f0cd97a563bbe8c11c2ea0/8784838597.pdfIn PDF document text
    • https://2acontractor.it/images/file/livasipudezofus.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f33b2a636b---xodarovirotib.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27e3edffd---vekiwagojomevogagajekiwuv.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/61435680453.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/padagutavigodavukubese.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd74298367---6449987812.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/dodipalutado.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/gexefozipade.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/tunosexufiforijexekino.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1ca722cba---34969067063.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608580da590e1---88003789551.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/tademogeginune.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/jugitavazosavetasowemik.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d95fa17e89---71971742426.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/zuvugejix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bible+let+the+words+of+my+mouthPDF 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_off00019c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C28 19412 bytes
SHA-256: 3c5e9292c15458e2f8032a6682828a5e6af92eead28bb34d77a3b94985ea7d6c
font_01_sfnt_off0001bd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD5F 21044 bytes
SHA-256: a34af3460d68bf5cab0cb24b2a9631861eb74570e6e2b8532d9838a6b9813d9c
font_02_sfnt_off0001f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F146 10848 bytes
SHA-256: 40e61d7b34a01b58aa6f5e14f5fd0f65659ca5b5e3182b08c7c87ddc7373d4fb
font_03_sfnt_off00020a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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