Malicious PDF — malware analysis report

Static analysis result for SHA-256 162d9b977bf0aa74…

MALICIOUS

PDF

88.6 KB Created: 2021-07-06 17:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e6a39b764a282af50fca33070abee40c SHA-1: e48b7ce6c7627c1a47f04bacb15c305e7db4142e SHA-256: 162d9b977bf0aa74c1d372ff3aae1901c40e7c1953b3888cc3424037c6d07d3a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste content into a command-line interface, a common technique to trick users into executing malicious commands. The numerous links to compromised CMS uploads and disposable hosting suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071461dc0d58---siboxuzip.pdf In PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51aa73468---kejalesujusulere.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/7228591759.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/wijajigobakepiwewikomom.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/358eec96c4e012ef1b177520209c0ce7/54163792108.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/2sgn6qqa66t1asq8g6cffj7mth/punowasagaxeli.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/73713814381.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/nigaxuvafanitaziregej.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16079595eef33c---rivujaros.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe302c7bb1---18254177123.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2dd69694241b682a1f38a22420bc9a21/32430256057.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/rijojozor.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/oo6sopomp27blsm1mdq5qtil95/60351279628.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050208041373499.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e5a3a59ef---28811477248.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d26d454a72---ratimox.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/96184431507.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacd71b31dd---kezagurutomuzi.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c54201ef4eb6938601ce1d6ffe2aea3e/67413514114.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/vusekuvemegaxatolemokag.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/nafasematozotimugozaka.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/n7p9qockpvkmmbagvuf5tugm9k/47323623940.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0724025bca---woxexakaj.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/56537594935.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/52858940583.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/9330601914c1386ca15260cbf44fa1f0/20457591474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=windows+7+iso+download+without+keyPDF 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_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 17736 bytes
SHA-256: 9ba02172713d8157d31345f49b80b033529089c73590d130484bec9044d86bb9
font_01_sfnt_off00012467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7E 10680 bytes
SHA-256: b9480784b41368bea64d9b1a9e46bb05c48c3ae0d67c4dba9c24056c2da3adf8

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