Malicious PDF — malware analysis report

Static analysis result for SHA-256 5929530d43453517…

MALICIOUS

PDF

88.6 KB Created: 2021-07-30 23:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98aaafe1e282ca9b37c4a25b95456b84 SHA-1: 2f0b7524f97fd06bad48598153409018ee4e390d SHA-256: 5929530d43453517666083f6a962aaf17d90dac762e770afe11c07605b436edd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple suspicious URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute phishing content or malware. The presence of external URIs and a link farm indicates a likely phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/0km49r637n38msjf79ptuthp0k/94956366903.pdf In PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d872eeadad---xufuzezef.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/xesuj.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/56102969278.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/widijaxusejixewuko.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/lokimogozulojofipewipi.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2039791dea1ec55138e02f281d23f42a/pumonavowomelewutifo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/dcfa5f00c1c9acfb492041d9e26535fe/nolofo.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210707_E355F5ADF7D4C7BF.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/10bvcuu8s04cvt6p9r2t04q99u/zupoxaxenigozixixale.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/952d1a894466ad908c8d86ccd9bfa894/doxalukamaberetipozitul.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16078c57fabc3d---95359821437.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd01bd1ed8---baragutawubebu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0rdoiucotgtokif0d9ecdin3p4/9658045583.pdfIn PDF document text
    • http://ilovemynewstemcells.com/clients/865932/File/57174403353.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/hj8gkfc2l276b6furfq16gdc71/21111486340.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/vejizizusuguvap.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/21624814188.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/1b74c0509a500f6f5d404bcd47733ca7/71746110694.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/44806125702.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/dapazur.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160826efc3f96d---xebenemul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+do+i+reset+my+stalwart+safePDF 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_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 18108 bytes
SHA-256: 2b91eac22df78cb841f6926c7690e2f62c4edcaffb18c4c6eec9284958bb270c
font_01_sfnt_off00012489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12489 10604 bytes
SHA-256: 7b39fff2d1d83a0fadef57afc8ec74084a4224a01fb12ac971839fa07dcc59c5
font_02_sfnt_off00013cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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