Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec53ce7f29df54fa…

MALICIOUS

PDF

73.5 KB Created: 2021-09-30 12:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 968f50d8de415e4da32f3d0c01b2399d SHA-1: a64c73d23c5fd44c2d6255efe84fb9c273cd2908 SHA-256: ec53ce7f29df54fab468295e1a5a065426fbebb3d5f879eb4b99090a4a682b9e
116 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, many of which point to websites hosted on compromised CMS platforms or disposable domains. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to lure users to potentially harmful external resources. The document body is unreadable, but the heuristics and URLs indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://gloria-eurex.com/images/blog/file/29081818553.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613289c703d61---geganijijaf.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/63740725256.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/87539993055.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/debogoporodan.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/72777825009.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210930_2CF0BB8873AE376F.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/pugoro.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/36962302348.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/gemopiju.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161462d1f62924---56246515614.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/navafuf.pdfPDF link annotation
    • http://prochem.vn/images/uploads/files/lumomikozizumamo.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/51567932703.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/18563405375.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/ladebuzepepepusufejuregi.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/dolorapopevuseraxez.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/rurug.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/3371242541.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/02adc9d52927c4341de5ff15b785dac7/delosonogorezib.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/14018010104.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bb8c984a3---42421417506.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/padopotamavegar.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/99268306969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sift+heads+7PDF 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_off0000b57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57D 10208 bytes
SHA-256: be50be2b0eefc6d9a41217ab7cb19e14822c87d8e452e55572339b7c3b7386c4
font_01_sfnt_off0000cc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 20280 bytes
SHA-256: e9dcf3d3bb61cc0b42caf34010ad3f96dfecb8cca25a6d0bf6bf0ee53110c258

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