Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac51ff18e61aedf…

MALICIOUS

PDF

67.8 KB Created: 2021-09-18 16:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2a751b7729dec777e83938fd8887044 SHA-1: b58fa5ac7a209d826fd43846134e648d2bf7ddb7 SHA-256: 2ac51ff18e61aedf3d355abae9f43ba0f26a3212364b5bea6e65c9942d4bdbe2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, suggesting the document is designed to redirect users to malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://synerhu.ru/uplcv?utm_term=digital+world+digimon+android+download PDF link annotation
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/katafuwotu.pdfIn PDF document text
    • http://panova-art.com/files/file/98225651047.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/55889757357.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/d7c215decbcc14570ca02082bc6e5b4e/28710676576.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/28665756017.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/57231765063.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/65044010471.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/1265261617.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630965111uQDV.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/kavis.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/89699726470.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/86863921812.pdfIn PDF document text
    • http://standardamulet.com/files/files/firuwejegap.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/99983101720.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/90568963117.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161371dc354345---gepesesa.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/53407417252.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/33798334214.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/kafewobe.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427d43986b0---jukaki.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/87151323864.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c5ccfe6d---56171545141.pdfIn PDF document text
    • http://indemo.pl/Image/files/41619478726.pdfIn PDF document text
    • 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_off0000ade2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F4 14924 bytes
SHA-256: 1b28c9609512adb3ddfb8045b92d223fe1b94a38e42068cb10c750cc0b29638e
font_02_sfnt_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 10380 bytes
SHA-256: 7439b7814983c4b3c43347c8549a7e01f82e9f804d609ab933589bc3a7c917a4

Open this report in the interactive analyzer, or submit your own file for analysis.