Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf44857a30ed8f2…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 15:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e49b2f18cdfccc7f36c5b5f6c0853a16 SHA-1: e5c0501f4be9e1b5914c7b69366d1d026adb80c6 SHA-256: fbf44857a30ed8f2ff50dd8f3b51d8d9ba2f8a37bc86b6400f7dd702c75a3b92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, with one URL specifically mimicking a Windows 10 ISO download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to download further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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--b1adrijbbb.xn--p1ai/upload_picture/81818325045.pdf In PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c48140db8a---81044254178.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/18115529105.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/65060326388.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136d9f1172ec---90941742441.pdfIn PDF document text
    • http://vejwun.cz/images/regegijabe.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/fojogevut.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/voxine.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/29184349438.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/3404276557.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613a8abf630af.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/foguruvaguxux.pdfIn PDF document text
    • http://gibisch.biz/files/files/2424495437.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/26537053984.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/13994599755.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/64670734311.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/73719777289.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/12491977773.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/buwabelovalogizo.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/pnoii1kbfrkgdbsoe877s7n6kp/76987193963.pdfIn PDF document text
    • http://samtle.net/ckupload/files/tikepirunabifufamalik.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/zajizinepigizisud.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210911_103708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=windows+10+iso+free+download+full+versionPDF 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_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 10668 bytes
SHA-256: 2f14f70575b5adf2ff23c76c9f35706e6a25b4089d1d8c4c79ebcbcd54327928
font_01_sfnt_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 16912 bytes
SHA-256: feea56eedfbf84eac1d983e0954d6f884784c10b6d4d7a3eb9918da0a68aed8b
font_02_sfnt_off000127af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1