Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cf93837e954e05…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 11:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f14b0c4063ad07c334c1fa83ea132ef5 SHA-1: 70019a249ce46a48a2d51beafdc200a5db48ce15 SHA-256: 87cf93837e954e05d2c0e7b73b26154c9c1943e7d46a1a3e00a8a04af1fc515d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript indicates potential for further malicious actions beyond simple link redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://prime-standard.com/piceditor/file/rixesutakunogemiwilukuran.pdf In PDF document text
    • http://blccy.com/userfiles/files/72048486649.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/wojubomazuji.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/xunamupi.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/rapovejo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de78f26fa---98083894678.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/8867403738.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/zipasodoparokozerotolaz.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/zelefidemumumujupowidi.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/felisegexajarev.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/35842012432.pdfIn PDF document text
    • http://ptktent.ru/userfiles/file/74937090039.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/15505829485.pdfIn PDF document text
    • http://airzo.net/userData/board/file/48711623680.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/mixiboda.pdfIn PDF document text
    • https://aaaxxion.info/images/file/79864150466.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/7e98a5ab6db3d1f4066586605efb079f/2186739037.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e8u8u6bcmu6u8pehqiue8mqb9/tokijokix.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/jogabinomarenefinalu.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/25443700525.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/34134843253.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1f28821d5---10860899428.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/kazajizijadisaxa.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/94163449586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=viber+deleted+messages+recovery+androidPDF 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_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 17500 bytes
SHA-256: 76a73ddd70fcef063d2813acffd0143b736c4620a26f1ec3ea76ce6031222db7
font_01_sfnt_off0001066d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E84 11000 bytes
SHA-256: 5491ac8183bf46fdd0f37f090befcbb296a0bf8bcd2a56e6143a75697806c63c

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