Malicious PDF — malware analysis report

Static analysis result for SHA-256 2166dd2190f8a2bb…

MALICIOUS

PDF

84.0 KB Created: 2021-06-29 00:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 90442a1ebcf9d3dc3e37b934b9725153 SHA-1: f3c79961c8ab2da9be60db11385bdec3ad8129d7 SHA-256: 2166dd2190f8a2bb498a25a57bc8ff1db130e8dedc47092b4d6983e0f1de46b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick users into interacting with these links, likely to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • 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://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099c55755dd5---lekubutefinobowonipubemox.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b732b86bdd---81963096067.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608eca8153780---vunokevag.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/lp9j9hbk4fp1gelpomp102eepo/77806758216.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7eff05a2---wujanasenavosasanif.pdfIn PDF document text
    • https://digicpictures.com/downloads/kifujataw.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/041026233959.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/62531694852.pdfIn PDF document text
    • http://armanetti.com/images/pamowekufiselero.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/vemokewapota.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/pavaxemubuzavalikasusosid.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/68150566118.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1cb12c0f742d3da4fd83217b95ca51c5/kawaxowekopupakir.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ff29da66416c2d406f949dcbb8df9afa/gekasiw.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/66568556770.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/db6b591cdff6a018b72601a82d195a97/rijofunup.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/zizaxudigadu.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3afda8915---96564276592.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/612v2hika8inbu3k9t1nsloup8/pukevufefivedivabavoxugu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773943dad99---tafaxegapasoj.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c48c12d0c9---98309179336.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/3sftjabur9lf4iqlpvb9q5ptb5/20958366510.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63271b704d---70525551709.pdfIn PDF document text
    • http://benrassam.com/uploads/files/24275460312.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5a8135dc913ec3281b3ba6f9d127a67a/vilapapojokoxokonuruz.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vofamasofipafirimifega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=certificate+of+satisfaction+mortgagePDF 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_off0000e5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BF 10664 bytes
SHA-256: ff8a38e545ac74e23afa99fefb30af0f8e0a825d26db41807fe021c899f87dd4
font_01_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 16912 bytes
SHA-256: 745003b8c8af48c4e2ab29c8cc5303b961678e8b7754c1e73e1c02b6a67cbf28
font_02_sfnt_off00012a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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