Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f199abf11fd5a41…

MALICIOUS

PDF

67.5 KB Created: 2021-09-28 19:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 470e08577cbda82f12b9cb1b7d4b3029 SHA-1: 15a8a8a3aa1e3f7568ba5add2fe2c137e92b0fab SHA-256: 8f199abf11fd5a41f3227a5f41e18d55a8f224b28bdeba606b5ea9a8acf4aee5
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF employs an image-based lure, presenting a screenshot to deceive users into clicking embedded links. These links lead to a farm of disposable hosting domains, a common tactic for phishing or distributing further malicious content. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://parateam.cz/file/14857144689.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7552f5ff2e6d2c66d5b423e3fb77c82c/13907798367.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/45747487536.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/vubives.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/raxetaziliselunudigi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8b78eb7f4---redovoxufoxuwogobijirur.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/xoxowugafu.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/radojesebukilereveber.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411d512cb1a---nufilowuzusenubitox.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/6258717074.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/11856344944.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/82759311296.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/56296992436.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091923570038.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/0913d431079a4c4bcb4fea89d5836de3/32889002597.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/ralemo.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/19906288653.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/89459220890.pdfIn PDF document text
    • http://cripper.de/media/lisivelotinabe.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/37929828216.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109081822209261.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://adaviestransportltd.com/userfiles/file/dagutuweru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=play+store+use+onlinePDF 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_off0000add6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E8 14212 bytes
SHA-256: ae4a284ae5e6329adae8736cdfa6a53039be3c696c2abb081351000fbda902fc
font_02_sfnt_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 10316 bytes
SHA-256: 35b1f3a0c372467f76e57fc99c125445448a5c84a1d7c7ddfe1811a874f09832

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