Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3379612764710ac…

MALICIOUS

PDF

90.5 KB Created: 2021-07-06 15:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e9fad4de348de1df643a2a11b0d1389 SHA-1: 5a050d731e2f7cdf40067fae333e45ae36f58be3 SHA-256: c3379612764710ac5ee05659559b36df2f36d48710c2f945ba77d4b63dc4cbad
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites hosting other PDF files. This structure suggests a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URIs and compromised CMS upload links supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 5

  • 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://cructi.ru/uplcv?utm_term=slap+in+the+face+synonym
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a391c8f9d---pidumidizorinewifikatedu.pdf
    • https://abofahed.com/userfiles/file/84661249197.pdf
    • https://assistenza-termica.it/file/tezigumosijarapum.pdf
    • https://repare-ton-smartphone.com/userfiles/file/65822922346.pdf
    • http://clinivetmadonnadirosa.eu/userfiles/files/xotuwawonatejop.pdf
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/busisomasibuwedasawodiv.pdf
    • https://lordoptika.hu/files/files/3374648180.pdf
    • http://bright-inter.com/file_media/file_image/file/fitudowulalamabozaxi.pdf
    • https://festival.bg/fckeditorfiles/file/26541775409.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608be6ac4a6c6---bibubozese.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e440af6b---sowekuretuwiwod.pdf
    • http://kapsalonvogue.nl/files/file/lofadiwibabupuxinogumuwu.pdf
    • http://osc-pribor.ru/products_pictures/file/marezokemitasotutol.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/af23018685f44ee6c68e17e8705eaac8/wojirujegam.pdf
    • http://print-printonline.com/ckfinder/userfiles/files/mifemipaturawizobuses.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/dc1166ba5817a577bc1cea1dd8267e04/dotosokewemowedogom.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/n0qr3s6qfrcskeqtq5st70psnq/14517924621.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a33958bd1---66351577157.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e646b3d5---42733171251.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f744cdf3e---gejevolabap.pdf
    • https://buka.ru/sadm_files/sipaxupozazurorumin.pdf
    • http://ecandrychow.pl/Image/files/vusariv.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52ab0e291d---75698682641.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f146.bin
b1c950320102f041adb17f8f0c1a716b821b8b4a621d4e49b1626ed4e6a3eb37
pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 19480 bytes
font_01_sfnt_off0001234e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1234E 16792 bytes
font_02_sfnt_off00013b65.bin
85e586f2a7a4515e730b7ea99a1a77cf40d8429f7b750b4ae85f221234b7a597
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B65 10832 bytes
font_03_sfnt_off0001542f.bin
15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1542F 1700 bytes