Malicious PDF — malware analysis report

Static analysis result for SHA-256 607cf2110b7b75c6…

MALICIOUS

PDF

80.3 KB Created: 2021-08-26 23:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7961205e16731d221f501876ad2c054a SHA-1: 06d0c84303947a07831a341fb3ef96fc359ab004 SHA-256: 607cf2110b7b75c6fc74d7f2e1ba21f34dd34233858922a71d0bd52f50c602b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2750bdb772aba0a0e141fe0703fa800b/nekulidoj.pdf In PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/9483cfaedb878743a545d4926e66255d/xododapigukatakazegikut.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/xilufuselewevuxamopejoro.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/46277422338.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66e23f1f0b---98283094137.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/funaloxepaduvemujoxosit.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/93774156867.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/04/file/20210704_034122_101.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/35253489e78f81fcc48f1833074e148e/wakijafe.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2c4e83f9864e9637339db1dbed2ab84a/jaxotu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117acae75ca9---51132356662.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/26147647494.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/xumalafewovumobijenolem.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/kokozasemuf.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/62559e9c44965aea95b453798b06f38d/vizevi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2498a8e5c---5450287724.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/2pn7ua6eu7k07tqsd2nddahi4u/tifowowufivolikokix.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/zibolapisibelezijufije.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/8045635467.pdfIn PDF document text
    • http://hasyo.net/files/file/pumotifovimo.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/13fd8cb2c0b89e91fde449d5b25cba29/28059344127.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4dc59dc49---didujijeborime.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/gamodokaraziwazosiga.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/norotaror.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=laughter+and+sadnessPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 16704 bytes
SHA-256: 0f5566a480ba6c074d400c219cf091aff3d4439f7ec31ccce59aac50d9e0a8e1
font_02_sfnt_off00011ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC1 10324 bytes
SHA-256: b1f0e659efdfa48704960a475d16a6599bbb031eaa6f55371f4fe5133a9d6067

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