Malicious PDF — malware analysis report

Static analysis result for SHA-256 effca1cc957e0c40…

MALICIOUS

PDF

79.7 KB Created: 2021-07-03 13:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de6a7792a1564b690b4eb616c1885801 SHA-1: ed09ac8bdf9da91e231b1ef452480c1c9397ebd5 SHA-256: effca1cc957e0c4077826aad6d13d8d8d3721a1b4544ec8b54b74f57cd8af56a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a link farm pointing to numerous disposable domains and compromised CMS upload directories, indicating an attempt to direct users to malicious content. The presence of these links suggests the primary purpose is to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=two+colons+in+one+sentence
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/3uncrn0e8ve20h9h5ndkoep6u1/sopatarimunamefelik.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c966ab5ca5---58841198531.pdf
    • http://byecook.com/ckupload/files/pukagigugegawasogorivuxe.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/c7f7e5d74d7614a0a356fecc3024b6bc/bugegadobopi.pdf
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/64011984330.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/83d226f247bf609a98062f493d942c8e/gosuxatukaxajojomi.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d31d0ffc378acf2987f9beb6e614b0e1/73873331218.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b41b1eb748---wofubolubijova.pdf
    • http://pivotal-technologies.com/userfiles/file/32831653237.pdf
    • https://moolans.com/uploads/files/39013740676.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d5cfb944b---ragulalanojewexobon.pdf
    • http://obrienbuilders.com/userfiles/file/97483846009.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/4jq7q0v3sk4chsln5o58i9fbqe/55344847521.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d66f09013e---22602558714.pdf
    • http://high-keenltd.com/userfiles/file/fupujoziroramexijumufobab.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ce2df28e---gitorokubozamuzivuw.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3a436e67---63943233762.pdf
    • http://wecans.net/_UploadFile/Images/file/dajepara.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ojecqvtk1t98i7lliqclri4od2/nanoxujefil.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5dfe807bc6---73112927119.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/3cff76d546ce6733411c06c9b1e80c72/2546163937.pdf
    • http://chinalabware.es/d/files/99026242042.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/uiuiaeuakml8h5mk044e4837i1/78956884807.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/528857e9fc9ca45d81802d60cf4543f1/70346291087.pdf
    • https://mediaget.com/userfiles/files/marena.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6fd.bin
0e37164877cb95c405add09371bf1432ae38c036f4553bfabfa2de57a55f81bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 10012 bytes
font_01_sfnt_off0000ed65.bin
2d425d349db3eefce141652a466bc121974b1b6c1af5fd77e0c62ec957d6ef49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 17088 bytes
font_02_sfnt_off00011988.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11988 16792 bytes

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