Malicious PDF — malware analysis report

Static analysis result for SHA-256 8737baf82abeadd7…

MALICIOUS

PDF

85.8 KB Created: 2021-09-14 03:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1a7b2174f2e026146d93d9efbe3aa46 SHA-1: cf70864fc0537157b8fe40056d468b56c8c3b1ec SHA-256: 8737baf82abeadd7f41c0d3c5b365107ed22f5445d317498e3204637e4997b29
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links to potentially untrusted sources suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/rikatogisowosikubem.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135116a45f99---9667518638.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/29423952039.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/nuwukivimiwefigoxo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/657ce199890e5c1db245eeaa17354ee6/ruwelibijimu.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8b232d7c---visinupanifeluxodenufena.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/fumesitozoxulirido.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/54150452264.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/8388996644.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/tonumazadenujaxumar.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/95010072757.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/fepuze.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/17656485144.pdfIn PDF document text
    • https://avenue102.com/uploads/file/tibuluzaxakete.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/negimugixus.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/17246914606.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090105534828.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/gelapuzolefod.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/bobinumimapapake.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kq5860tog0ovv84ee10lqi1asa/33861976882.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/17889531527.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/29706161674.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/debajemalik.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/89385563856.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210910123127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=poe+teaching+strategyPDF 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_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 10576 bytes
SHA-256: bed8e5ac845bb92d9cc469253a6b85931a2b6c9758ac5a731fe2c12ab4b1baa1
font_02_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 17708 bytes
SHA-256: 7b23de43ec9e0dd6ee073c753dbce0c7854ff6f8fc318220f1ce0d0b27d8a1bf

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