Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e57cda543a8552a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-18 23:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5aa0b6610941649fca9b0b4805e3c874 SHA-1: 10294000cf50f66f9ebdec66daeb67c75c46cf32 SHA-256: 0e57cda543a8552a095ee4000ce9ae979190825aeb3b7a64a59d2dc52735ab33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/b3cmjcdfr0pgh3p0h49p4g7ik5/pemufowif.pdf In PDF document text
    • http://hifitness.hu/userfiles/file/danoxoxigidinazumalaji.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/75306480984.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/zodogibakekarovo.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/46338646599.pdfIn PDF document text
    • http://travellerisland.com/files/69856708832.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/45719738088.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/68189726415.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613392d05be44---miwuwarafezigolififizos.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/wubabo.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/wanefuxoraderujajiraz.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/71477146174.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413f944385e---jepupakujisopimepi.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/4835553768.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/q885vm0l0nfik39k1eqb05j4qn/69615893556.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/sosinobomoluzitutulezese.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613da787e99bc---52249168725.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/36529648009.pdfIn PDF document text
    • http://soc-in.com/data/media/files/52639787729.pdfIn PDF document text
    • http://kaies.net/upfiles/file/425364061.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/vebifisemelonakirirodavu.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/karudevasutodop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=torrent+movies+linkPDF 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_off0000b775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB775 16248 bytes
SHA-256: c6dc0612178b08995436aed5421b582f2c6626b85c2edcf6296eb1d8316b17b5
font_01_sfnt_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 10228 bytes
SHA-256: 889b0e81c7c9196ba1d56e98e40015084a53009ef60a20f9e1a460e369d34847
font_02_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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