Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf76caac5a194f9…

MALICIOUS

PDF

87.4 KB Created: 2021-06-26 10:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bc073c754bf40ec42ce9a4268322a4dd SHA-1: a8727ce3f003fece1e4cd914abf05bd738d9d128 SHA-256: adf76caac5a194f95d9c64b05ea4882fd2847619d7c904e270587be1d610772a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS uploads and using UTM parameters, indicating a link farm designed to direct users to potentially malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its deceptive link structure and potential for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://vanphongphampmc.com/upload/files/widepowewajide.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/984ecc214f45e73865e6729d94d13176/mozomubom.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/betofefovu.pdfIn PDF document text
    • https://t2sc.me/userfiles/32708678701.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d6238d52f4c9a1134eb88a2f8aa03e37/33552177494.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/mobokutovawuda.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/lodusejoxujupoxaw.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c03b46bb---48643274392.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3821f2564---4060017573.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/womazuwof.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5cfb8dbf7---sakekerune.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6e61abe4958e08f5476e0b2891ecac78/lusefiresupes.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ec7dd7dc87e6824695d79955710db5c3/4866071814.pdfIn PDF document text
    • http://beta-rc.com/upload/files/kekoseledijapawew.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/47fa30f6718de1f18764ad9e7edf18c3/julusojokowodadapuko.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d114d9ed2---ritivilevixenaliz.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b61a6b9dfe---56412876525.pdfIn PDF document text
    • http://martonelektro.hu/files/file/425581179.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b403dcc5c8---10969297410.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/79682247998.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/36a72efa632d4c559aae17c0df27750b/fududivevirivexenalokeg.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/xibujovafofibov.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/sitjm22nvnq4tpo77t85c5ee9s/pinobawapazobafadatezos.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20cdd5417a---23413576761.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16076028f0fca1---xagaxavod.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076838d43743---97364209068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+copy+whole+page+in+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_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 10824 bytes
SHA-256: c3b8c583136c63a561b5afe16a94ad4e8822793f1f32be46a2dc640e4409f65a
font_01_sfnt_off00010c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 16832 bytes
SHA-256: bd6e3039eaf41e67a6a8ac970618fa3ed00bd36e3523ab891a27eaca09618cd9
font_02_sfnt_off0001382f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1