Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d6a175290c49c7…

MALICIOUS

PDF

82.2 KB Created: 2021-07-04 12:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 16d6ce06afa43fb085191427c0b61f97 SHA-1: 80108ed7f4215be788ef7565ea802b3162b08b97 SHA-256: 10d6a175290c49c71523d5c5c77e8103cf2d7037c761848190af2199e3a9f012
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, including those hosted on disposable domains and WordPress upload storage. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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 http://duepassidalcentro.it/userfiles/files/80022332493.pdf In PDF document text
    • https://dialogueinpraxis.net/files/docs/99538541518.pdfIn PDF document text
    • http://www.radiooro.com.mx/media/images/uploads/files/dejev.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c31cca50fad---39043464610.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-6/20210506172224324919.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f5a48d9aa6fd839fab5cf5b23de1c989/45340576153.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/lt5b0ik64i64r3m7flcbaka4m6/jesojanutevolut.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/n4qca35n7f4onon2jsre319b2d/76752130933.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091d7f5aac1a---39482261802.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945d3106a40---vaziki.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/rolemulugekitopafalelakes.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/rukonikijipe.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/vosezizijojunilexekebaj.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839816c0ad9---nujanapoporaro.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdec916fa4---jigimufipobonilosol.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee766f279e---43023606280.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608406595930c.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/xokokijitawe.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/22563593181.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9j6esl8e5532tsbaed265s880f/10340214660.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/genafonu.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/i4jp20halg134uf1sht26q48b5/50083316999.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/49297422971.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609a8032312a9---niwamej.pdfIn PDF document text
    • http://kbchina.de/upload/fexofubofirunijiwagezejod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+many+lands+in+a+40+card+deckPDF 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_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 10916 bytes
SHA-256: a4025e44fa48bd1628184f83921922da292cfdbb08c03e825a5bfbdda0d1c2f3
font_01_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 17000 bytes
SHA-256: 909bb99e66d5ad335b3af5e625fd676967b9df4b9524255b4f6d8c0943b92d94
font_02_sfnt_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1