Malicious PDF — malware analysis report

Static analysis result for SHA-256 87911a013d4d1082…

MALICIOUS

PDF

104.3 KB Created: 2021-08-14 19:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8243aad293b43fe609f978a93acae9a7 SHA-1: bcf463f90816287cdb6c9fab7933177a12385f20 SHA-256: 87911a013d4d10820f2a9b9c4d593d9d39dbb252acc82ce5d155e45ae9a74e9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://synerhu.ru/uplcv?utm_term=cuales+son+las+capacidades+fisicas+coordinativas+y+su+definicion PDF link annotation
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/affe90e3cc41c451e244bdb2c144772f/repebuse.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/201559faac5d92a4a011b32ffc2f8ef2/wegikixesejoge.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0847156b---32504691448.pdfIn PDF document text
    • https://buka.ru/sadm_files/videsekefi.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/46f8576cf913ad60575a694393e36dd8/49905456916.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1255253f1e---gefegepikumajebo.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/kejok.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a08343c22c---94448254433.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021051915431651.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/k80mudn9gjccif8s3sle564j70/benonomapi.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c948e092cb---vozazumedododepase.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/93704408125.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/70416183727.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/52d2dd70b560ece71282547202f73a4d/17115416764.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/dc424f2defa1a6d98908164128569e5b/30486408363.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfe70cfc9c---37942557808.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964b6351104---fajisevufikidovelaxibupoz.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/xiviburewuzovewu.pdfIn PDF document text
    • http://donghocitizenchinhhang.com/uploads/userfiles/file/59411104069.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/vodafosipitozemob.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/sujavimezimubulima.pdfIn PDF document text
    • 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_off00012e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14644 19084 bytes
SHA-256: d4a7c1d095154b02f4a23f50034f86b4d831dff7048149c63dd54ef81b541a74
font_02_sfnt_off000176d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D3 10924 bytes
SHA-256: d716e7bb922bcde93ff8f9696d4f50bb3325cfb3f9e8e83700559c202e6d7709

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