Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e9beaa9e8d0315…

MALICIOUS

PDF

102.5 KB Created: 2021-07-04 13:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 519c48369a06f6ed88763a6e861dd150 SHA-1: 511b6aa8b3c6f857ebc627b946e62ad2dbe391b2 SHA-256: 52e9beaa9e8d031525c464184bf6c9ec7b5288ab82aeee32f64c56b003ce6d7d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. While no scripts were extracted, the structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://ismart99.net/upload/files/47086636648.pdf In PDF document text
    • http://www.knickmeier.net/images/pageimg/file/78429051616.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/58956928049.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/31615280931.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e152e4025---36884795973.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/lavox.pdfIn PDF document text
    • https://raljob.com/userfiles/file/wolomepavelizob.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1d8f07f4ee2f37dee203b81258a6c9a6/12711945898.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c43226db51e---93632035278.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/45410487334.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609fae6170686---femuler.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/55643214245.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/mog3dbm3lgs4p7i37ofcj51dbl/91405460865.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082dbcad43a9---gatixudagivolakopafamavi.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/ruruv.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa762e3c00f---85128043573.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/dalawetamujejevurab.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de39997494---18590092157.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e1afc7be5aebd3193c2e08e830fcdf66/6241407729.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7b31a5235---ligusupojuwora.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3ee2ca98704030742fbaea5cf8e2e59f/sunoxowopezopu.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/sonepogetojijip.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/zosub.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/pn1gr80m5gdimejth6jcv490a0/16660780637.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/4bde9757cdacaa1a2fa2121d49f21397/tamoxavuzuximelixafepagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=comparable+array+javaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012b43.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12B43 17472 bytes
SHA-256: 45b162c2e04192e44a62d86b8042c2352605c39f7aa0bf5c5b479a93ec9899e9
font_00_sfnt_off000113d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 10432 bytes
SHA-256: da73c406971a0f4c2b5c322198b630515888b2a4178092b35526c6618c86965a
font_02_sfnt_off000145bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BF 17660 bytes
SHA-256: d1446770b5a652fa7021fdbddca550b68d5a298fb70985a5d5cd418e4d66f243
font_03_sfnt_off00017461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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