Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19e881292db83e0…

MALICIOUS

PDF

92.7 KB Created: 2021-08-12 07:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1be09dd9e3760d5b73bb44f95296ec3f SHA-1: a5d31d57c30dd81cf31ead4a2eb8fae79dbe72ad SHA-256: b19e881292db83e06de71293e17a43c2100503406d2bb3bbed49a528906d77a5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm indicators suggests the primary purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=exercice+repr%C3%A9sentation+de+lewis+seconde+pdf PDF link annotation
    • http://www.jindatunnel.com/up_files/file/dukovinibi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24cdaaafa1---65412828890.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/kovowa.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d00bfe8f369---10584255758.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/mitedadinesavetemoju.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/68800674447.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/39566458457.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30781a7a1e---zesopapepukufax.pdfIn PDF document text
    • https://sanagustin.cl/files/dagevonijasu.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/49824079497.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/78238549805.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5287ea7d8---dotexurim.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ec6ka7p2mvoatvk09vbf5gqtrc/sazedunazemitekipazabetom.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/vinexegi.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/32279323975.pdfIn PDF document text
    • http://reichspfarrer.sk/file/tejamamijedazikemijezotow.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/37030105042.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/65936701776.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/75661469012.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/19287939205.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/gr2je786sb6cs00t7b123uvbab/45800852714.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22691b9ee---fojedazidavufet.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a643f13fcbc---tonovujudupewira.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/gonokitijegaxi.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/34370888992.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5g8k4r4b0i07h9ansel2jsara5/22972663219.pdfIn PDF document text
    • https://papiratisk.cz/soubory/zabudaxepewaxotikiked.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_off000102c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C3 10936 bytes
SHA-256: 1299b6ddd439def811c647a2d283a418f360be6588fc0bb9922c2abb18f03848
font_01_sfnt_off00011c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C01 17816 bytes
SHA-256: 305083a8d25a01a61f7ab78b80401984b0a5a856faf5ce6760a4c44d41487f8d
font_02_sfnt_off0001499f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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