Malicious PDF — malware analysis report

Static analysis result for SHA-256 050276a4a869093a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 13:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 643fd7c81413c8b968054e5d884b518e SHA-1: 3fc0fe5141b9c99282ae8122a183495373ad9ea3 SHA-256: 050276a4a869093a312926b754c67eb290b2b2372f49cfcb01daf3ea9c25ebbe
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, suggesting an attempt to hide its true purpose, which is likely to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://binarbaidequipment.com/public_html/userfiles/file/6273664705.pdf In PDF document text
    • https://oklogistic.lv/upload/file/lekobezazuzi.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/wedavipijinujamesawog.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/54762022254.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/41913728130.pdfIn PDF document text
    • https://rotherelectric.com/files/nilitizubo.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/repifebibilewidozewuza.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210607_28E6F86D3D23997A.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/98729991976.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/luvudeze.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/mufev.pdfIn PDF document text
    • https://media-get.com/userfiles/files/sofewixiguniresigimevo.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/wenujemogo.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/10/file/20210710_141939_161.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/d9h8shqeu3c5sa7bk8on9posl8/babafesavijogevuxof.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/95772175833.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/31693454930.pdfIn PDF document text
    • http://htcable.cn/d/files/65920600146.pdfIn PDF document text
    • http://mosjob.ru/images/file/30054888825.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/24854122587.pdfIn PDF document text
    • http://airsoft1.ro/files/file/gimabarenixavor.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/44d7718e881565601387ca29dbfa6973/78425329963.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/0fec3e6e9a50866d14c4b81a7344a5ac/78116918362.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079b6e5ac074---41400890204.pdfIn PDF document text
    • http://risme.vn/files/23776830664.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/78752948303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fly+away+tones+and+i+download+mp3PDF 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_off0000d514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 10800 bytes
SHA-256: c916b87899543b91f3db73eccfa9343815ca08cd64ca42575b27ca37b0737bc1
font_01_sfnt_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 19080 bytes
SHA-256: adb51335eaca2a108b8c6da9d90c9f1c5721e6173351cbb89ca2159b5fb3cb37

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