Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e010fac8b9e9bb…

MALICIOUS

PDF

85.7 KB Created: 2021-08-15 02:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b85d4ceb67e23d094d4f45235b74fa2f SHA-1: ff850bb479de77a1d45fb0ea51b2c686ad771499 SHA-256: 77e010fac8b9e9bb8a1c4b0182dfbabfc73bda5a78a9c8e18774a1311fac40b6
204 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The heuristics indicate lures related to invoices and remote support tools, suggesting a phishing or social engineering attempt. Although no scripts were explicitly extracted, the PDF structure and link farm activity strongly suggest it's designed to redirect users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dbt9u6gqecirh877i1vmr7da24/88327691860.pdf In PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/29e94e78d7303d5d7c4feddaaec9cf87/tidoretozopalevokojil.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6728465c3869a6ade1af872db8801dfa/66139575394.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/76676677678.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/47428507033.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210730085423_mb964c.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b877b09cac---nutibuposukimakot.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/14018839623.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/c4914ac566209ccc0461c2e4b78f364c/88762093810.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/24004965196.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8efd1c0a9---waxovovinufidor.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/97767602193.pdfIn PDF document text
    • https://emprenderem.cl/files/37188370153.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/61b60a8feaa58cd184e3cb2205b932e3/18187021439.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2dfb627b6---60699047350.pdfIn PDF document text
    • http://davcpundri.com/css/file/gixokazifajopugaxibu.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/95417676837.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/zaxuzuke.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0cfb00f85---bezilozemi.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/dalawoduxisesibiterojula.pdfIn PDF document text
    • http://chpcentre.com/files/file/88663489744.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9c427a6912fa0a5a9b6d1192f2668ad8/xuvufaloraturebim.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16099032052f11---75021479191.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb467d63f4---90563113286.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/d0u9nk4oautdvsdiauh9bhquo0/74475712288.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c5faca81cc0e0d3a56180dcb308b2de8/mojoxitozobugaveva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+write+a+request+letter+for+commissionPDF 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_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 10820 bytes
SHA-256: a9fcb4f034007e2f8b8e29bd811ea4e2a990489619ec50ad504abf2e2941613e
font_02_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 16424 bytes
SHA-256: f3037cf9aca76ea4fc5a47e8bf78989feec44d2dab0df53a03dad66dcb01feb1

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