Malicious PDF — malware analysis report

Static analysis result for SHA-256 839da298c48d84a4…

MALICIOUS

PDF

89.8 KB Created: 2021-09-02 12:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 532555cdd45497e47300e120fdc1b08f SHA-1: 4e8df1c4c1642e275f7ebee63d16e93aebd10c35 SHA-256: 839da298c48d84a4fee2e90aa5b4b125fdeb8655e31a4a900b771cef210f4b5f
164 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. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://avonsteel.com/UserFiles/file/50936443050.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5681df149---67509099658.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba355516e---10834047703.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/87939630099.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1d51aff36---gagipepikesatuga.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/nivemilasibigevuketil.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/82625849125.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/95050967194.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/667bfc1b032a9c1f2ff229e51f8ed58d/66485008000.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609591afab32f---nedugapeliwatepi.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/14396248099.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b2407103f---nixegorisosenomojapoj.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9e66db536666584bc677f8c0e71aff46/mabisusugojakevanuxarolof.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/48b4559bfa906527a6a28ba92017d86a/15679384359.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/3966169667.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/fojukapokinokum.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8eac3a617ec8b064117b2871a5acce23/gasemalobasavafewuk.pdfIn PDF document text
    • http://schokobrunnen.com/idata/lamemegiju.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/dbc6f8bfebd1468c70f054afbd4a3a13/49772702870.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b621a832f55---rupigadaladefixajarawasu.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/88125180762.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/nubuzopimobalivim.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/mofiresugixosafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=general+knowledge+questions+and+answers+in+tamil+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_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 18160 bytes
SHA-256: ce84fa7576519008ebed90abf7ebc81abaf4db18f47b7854eb37f11b5a876b26
font_01_sfnt_off000126bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BF 11304 bytes
SHA-256: 97ec672d29206a96431dafa896a068c16da082438cffdb074dc4c1b4c813d9c8
font_02_sfnt_off000140dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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