Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f8184ccefdb8e9…

MALICIOUS

PDF

84.3 KB Created: 2021-08-24 12:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9eb9121107ac94bb567ac1be5b14f053 SHA-1: 3eac3e87688d39d8ad348cc18c0d2de940ddc462 SHA-256: 16f8184ccefdb8e9e539e75952190eefba0d415668bd780191a1b65b343e4adf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://greenvisioninternational.gm/userfiles/file/fefamebisamirikupe.pdf In PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c54299a1cc9---xawopezuwefabevajegi.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/29525108918.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/28834410723.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef1fa7aa31---lagekizezovavidenesokej.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/viwiwedomokegeluxulil.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/d3de80869d84697e59bd50456b0f4237/xorejoxowibemupaxulegupal.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/91301312589.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/36872955501.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/menumisufaponizefawizip.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/zujepibunu.pdfIn PDF document text
    • http://elma1.ru/!upload/files/24933176375.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/67602826410.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9974d6cdc4---katolijezupiripojuvono.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/c9eb0d046622f98c2e82beb33f7b9438/sezubuwamoxozuvad.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210713231216.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607878b6b77d2---19842120436.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/bulokezekiwej.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/jivebelajaxovaker.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/nesixuritonukulusepeluj.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/linirevopog.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/zubaxa.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/48339859298.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92cfda51dc---fefexofigiziveji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+as+we+worship+you+by+don+moenPDF 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_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 17428 bytes
SHA-256: bf0813fbb500efceda7c34827467fcdcff9908a7ba964520feb8a42ae4f32f2a
font_01_sfnt_off0001123f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 11000 bytes
SHA-256: 4c72641f2bea1497c2083e041e14b6d498c2566bc9ed0f093d0e7587cd26e490
font_02_sfnt_off00012b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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