Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b24984fa374b5ab…

MALICIOUS

PDF

109.3 KB Created: 2021-06-28 04:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1d517ce17891d125ee770847c58ea7a6 SHA-1: 13902426633dd063b4e7bbd68ed7acfc1dab9828 SHA-256: 3b24984fa374b5abe0beff20452854da64af6310e2b1edc873b450c0aa8a03ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL targets are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9813

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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ba0136701c08a61692e18e02744a8395/fovaja.pdf In PDF document text
    • http://falerisztika.hu/tmp/zotoret.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/mr3p99jvp9rqvk08j1p9ifibdf/26765390904.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd922b300---31746902088.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/64c1dd90e211008e89d36b3058760b89/1296045353.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/20768036917.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/togeni.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/u3045hdhsjmo1ss5s8pf9185jf/50868824810.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b8c9fcd78671b8e1482d39156715f8cd/96116530117.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/c176f73f4d94c2dfe22f8cdb5b9f3975/gixuge.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7d630e9b---rixufaxerixiwod.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/fomirujuxenavad.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105261029242771.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/52425790233.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851edd548d2---biladukaninuzaxeg.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081735969422---jidivitowexudilopela.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160712e160908f---30168725356.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e373ac28c5---92164413595.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/iuhikqvttubdbrpq245frcv9h1/29021177.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b44c646d6089b82d587f5425a73fa3aa/97334480166.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a61fed87b---rabefesujarinit.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/bd0ff76aafb93918a7615eb9b200d4e0/zoganoxobovevudewetot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=meaning+of+cruderPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000165ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x165AB 24812 bytes
SHA-256: 27ce165c67bee6e503e9e7cef8649592fed1f83eeff5d40d9aaf95d8667b676f
font_00_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 27072 bytes
SHA-256: 36457b5e2c251d256a1f5a407d7925371efdeb05cb375c9db1d340d464a70293
font_01_sfnt_off00013612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E29 10432 bytes
SHA-256: 9cb03e0b62ca761d958f95868f511ebaf0177acf176785ddc24edf20e8d21247
font_04_sfnt_off000193fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193FD 4932 bytes
SHA-256: 5bcde48e7288e34bfaabfabbabc5a47cec23c12e875ec93fc9243eb947d0d164

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