Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa570d9256e8101…

MALICIOUS

PDF

101.2 KB Created: 2021-07-14 01:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c8c4546ef6a30294605a32ae0f80ee85 SHA-1: e3bbf259345a9239645fe987bea3e8669fa8f275 SHA-256: 0fa570d9256e81013d34b390f506bd67d9dd6297f8167bc62378916e6dc67500
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, potentially exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

Heuristics 6

  • 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.
  • 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://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84227c0f8---mimidibatajebu.pdf In PDF document text
    • https://bititechnika.com/uploads/file/fogomijik.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/64ufiph6u209cqcj12gsi4i8cu/julumonosedaxonudul.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/kudej.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/bo7mto3rnnkvf31iinu6qvc502/10364687931.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/gikidesonipisav.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/rgadqec75g765dq3qemgajfnb2/gekogolexomejomupeba.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/22755950737.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/sugibakavedorodadiwofulo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160752cf2f0908---gutotolege.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///ragagavusojebi.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/74626227422.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/66507357830.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/19050715615.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/83100116332.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/babapow.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/685c05801a8e56b4aaa0966dde544e7f/xojolaj.pdfIn PDF document text
    • http://dges.in/userfiles/file/33138284683.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608af878bedb4---36257010455.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d0ab697d1a18172a23352fb802a769d8/jogesa.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096eaaf5a360---93270548961.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2vqlats3pog254509do9p1mbi6/lelipenejuzapal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+make+your+crush+talk+to+you+on+instagramPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001295a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295A 17036 bytes
SHA-256: 7a9fa790b8a0a3b4b2c24d259d219b355fd9b3976f491ac1c0cdd060d1302ca9
font_02_sfnt_off000155f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F8 11060 bytes
SHA-256: 86eb3f9c9593a1a438b5d7baf0272dfc32043cc7bef5c56a499b01e6a91b7ace
font_03_sfnt_off00016f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F90 16664 bytes
SHA-256: d240a98b348ad4f217abdd049d2cdd54cd80e99d20ebba4b08d031d70f49324a

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