Malicious PDF — malware analysis report

Static analysis result for SHA-256 a242447db9d57942…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 15:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72999d9d31fa302879946868f641507f SHA-1: 5e42951911f1c1cebdcf7d8056a010be5d1a35d1 SHA-256: a242447db9d57942327f9dd8c64f9ff2d30f26a50484ff230af38fc57ba27603
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these link farms. No scripts were extracted, and the document body was unreadable, so the analysis relies on the PDF-specific heuristics and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nhahangbienhaitien.com/uploads/files/wepopilumamebowirobevore.pdf In PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/vegedutejalalupukitudewem.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/4648238883.pdfIn PDF document text
    • https://endobible.com/userfiles/file/koxegitinixovefog.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/lidozerasapibos.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/vawot.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/pujekun.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/toworuduvufadeluvomababin.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/wutotugab.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/videdufejex.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/63ml5mo5h14q462dl4g5807e8h/1176104504.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2mhbtre53d0aehpa8rot38ptf8/56974879631.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/sububekipejofurakisup.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/velaje.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc46095ce5---88048657017.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090308075173499.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd0b2eb75---modozal.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/mowevukofodosidizasi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd4968d60---32613689865.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/30020212075.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d721a50c006a0591ca811af688bc3b63/fidivu.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/domavuzalevax.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/56545718672.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/82170238796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=nintendo+ds+emulator+romsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F5 10484 bytes
SHA-256: 846a605b6411dbb7f6bea999d24e9c954ec0bf631311bd0e3a463a434d91c6e2
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 19320 bytes
SHA-256: e761d715b09fe2aacf25981e6b457eae772810665d92d39a5c111bb9c35af4d5
font_02_sfnt_off0001215d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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