Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c2610caea58346…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 22:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d142a3e83ee65ad493cd3c70653aeb53 SHA-1: 5d3ab07588ce582027f2783d8395cebc6ba960f9 SHA-256: b1c2610caea58346995756f885bf87b3d4cedb719d7591ed65d7f56e56f6d0ab
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, hosting the malicious PDF on multiple compromised websites, and includes a visual download button lure. The presence of numerous unknown URLs associated with compromised CMS uploads suggests an attempt to distribute a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d41972f61---97775996911.pdf In PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/pewonojiwomivoboruxaruki.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/76644226881.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/55483587562.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a30b189f0b---74084549586.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5cb998d84---28062615216.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0q399au499aqqgobphu3197ir0/6788587237.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/12007505772.pdfIn PDF document text
    • http://web68s.com/upload/files/mafalesibiwopawatawusolik.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/36692273037.pdfIn PDF document text
    • http://maihome.hu/admin1/file/17657662761.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b74b71465fa5b9e69c7fa804e900837c/97222649254.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/16557549570.pdfIn PDF document text
    • http://gibisch.info/files/files/tikodamu.pdfIn PDF document text
    • https://wrd13.com/force/file/misidani.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39539013144.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be5385b6913---68577647.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/1e65440c20e6cb1b029a92e4e5baaf78/rabepileze.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747bb08feb8---kegeteweris.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u5cjuu2hb2halt0gfq47pgmqf4/fotagigidazegaretubuvakit.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/nuxekosebaxororipuv.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/52887161273.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/32309604530.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/drp0c1r1npptau9t1e1tmogkhj/64962091047.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/vazesomuleragub.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/fuvutajifo.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdc9f3a47a---lizetolojeli.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/75201958173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=latihan+suku+kata+pdfPDF 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_off0000c1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F4 17584 bytes
SHA-256: 27eb232a2fa9b29084c6a23ac25bb0dd332572fef9e13d38f787d0d5565ce140
font_01_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 10348 bytes
SHA-256: f0f971dcee0d4ce488f56f205f25053eb490cef855f2e652600d57d2fcf446e5