Malicious PDF — malware analysis report

Static analysis result for SHA-256 df57c2d001e4e8d3…

MALICIOUS

PDF

75.1 KB Created: 2021-09-13 09:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae4e1d70e1c09357362e13d587afbc41 SHA-1: d6f2f24bc3e51f1440d0005a4b897a781f548bea SHA-256: df57c2d001e4e8d303eb452fb9f3eff34f2d7dde1bd9adf9eea5f187a244fec6
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The file functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM firing support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df23748b65---10888089926.pdf In PDF document text
    • https://ls-machinery.com/uploadpic/files/202109020328447544.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/42249522952.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/797d1e63527e484953147a86171e1503/nifuroxefiwetigejenefifag.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c15029af---wavixatumog.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/pevonulefogod.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/6768417318.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/85671159210.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/76357938308.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/78988001080.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/xupusijov.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/defonugevomedesezofotaxox.pdfIn PDF document text
    • http://haki.vn/uploads/files/bemititiv.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613726541b8cc---67953577670.pdfIn PDF document text
    • https://sambelteri.com/contents/files/38778271373.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613886d4c1c57---18135931107.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/dinatekib.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109091850286826.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/kuraxomibesu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7c6216ba1---56987701520.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/fomar.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/29992613889.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/92743647200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ouran+highschool+host+club+manga+volume+1+pdfPDF 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_off0000bee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE8 11448 bytes
SHA-256: 5809175c88046581db82fa2ebdfdcb3c771b806bfa32012d3cf5cb2f3adef790
font_01_sfnt_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 17384 bytes
SHA-256: a3ab7da4397fdbdba7e9a684a66eb7b32584544692585b5bff2cc5d9d059cc4c

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