Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc552d610b4ad6f4…

MALICIOUS

PDF

70.6 KB Created: 2021-09-05 17:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3c6536178aa41d7e1c623fb9b8ab3e10 SHA-1: 1d4011b7161165256f644af181a7143d9fabb90a SHA-256: cc552d610b4ad6f4cc2922f515e8e0bd4bcdb7e807423e327a30e06a83192666
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting it is used to distribute or redirect to malicious content. The presence of embedded URIs further supports its role as a lure, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://namlongadc.vn/uploads/news/files/wosupew.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94be89208e---tazabititikipuna.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14558077b---77042060676.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/62037024039.pdfIn PDF document text
    • http://medipharmacompany.com/userfiles/files/32919443466.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/gesuwezetowewupuk.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb21b9980b---wesalewubibojaraveve.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/32121454147.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/7453123221.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/27313011159.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/vafibowufexamovekenadi.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/23658964816.pdfIn PDF document text
    • https://trieurodata.ro/images/file/84245512918.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/7arskcperomtkc6bncet5ghn6b/20173832739.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7baa6d85d---kerigumabubano.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161164240b83cd---xobumoxiximusevotutevog.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bdecdb486ad---99280658160.pdfPDF link annotation
    • https://podereilmontaleo.it/writable/public/userfiles/file/60899743368.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f169967b9f---78008633666.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/85710368473.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210817/files/20210817221444.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/lepodefosazubawap.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/55365209550.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/73858024512.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/to2piv5mmv1rabavulm5mpj8l2/tixurugawefexeniveromorol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=form+212+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_off0000b775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB775 15488 bytes
SHA-256: 55ee5020fc539630a2c94c6a3f4ffdd6c70c4cea4b230830a35f6b48febbbe96
font_01_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 10004 bytes
SHA-256: 34445ec4e3e9da3293df0c0de4c80c9deb02f08e9f5c92b3c57b4bb0428ccd0a
font_02_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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