Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ebf79820fbb5b5…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 16:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ac79bc50bed0de1e7e4fff3cc1f407da SHA-1: 92aa851be0e13b16641898f415f49b38dd9deed0 SHA-256: b8ebf79820fbb5b50a5fba9ebf789ccc2bf4bfecd2342e1d44ed79640f94ce54
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://catamma.ru/uplcv?utm_term=sword+art+online+dubbed+free PDF link annotation
    • http://ginzaoakland.com/uploads/files/77813899072.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/82270569601.pdfIn PDF document text
    • http://soles2walk.cz/data/file/birosifewinoxoledat.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7c6fa1034c01cc751fe2a54eff53d899/tameraxi.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e5fa8eb0---72471019644.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091005045073499.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4a459069e---81196824066.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/maromapaniravagabed.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210911094616.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/5715112662.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/15553529929.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/tosetafowejatilobifison.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/98776532649.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/pezujugafevute.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/renabutetaduxixuxu.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/kizaroladebifojaxajabapun.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0ca4kh5v6n26mrdrhthgh23ndj/gegugolomuzakizevuzuneluw.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5b2adc817---29839699133.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/8991977814.pdfIn PDF document text
    • http://fullx.net/files/13917969198.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/wufalunepibisadote.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/musofoluginuron.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/kejixawevevoz.pdfIn PDF document text
    • 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_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 16060 bytes
SHA-256: b23daf4e6fce333a8861b93e5e058fe48c8c2d7228ffc1a779866a51abd0c494
font_02_sfnt_off0001253b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 10580 bytes
SHA-256: 3a8372909056ee123dd729d6762871ebd9fe4b9cf0acaf02f1f50762fd408948

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