Malicious PDF — malware analysis report

Static analysis result for SHA-256 da95b3f28dbe4baf…

MALICIOUS

PDF

73.5 KB Created: 2021-09-28 01:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e83c41c9870d7cbf0f3af369626605b SHA-1: 2d4b5e18a5724682c0fded7d92cbd033fb3c7deb SHA-256: da95b3f28dbe4bafa99ff67a39ae98a962b5b0bdae41d3a41d1fdef93d7fdffa
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://simbotour.ro/ckfinder/userfiles/files/76515769961.pdf In PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/70582956504.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/noxexuxixaratikamuleg.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/53106327483.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb7a6aa9e---8230770693.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/4780954033.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/dfdda22dd3661a45a0e229c1e41a24aa/kovujazezuroz.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/pekota.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/15883126569.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/xewin.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/21230266040.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/finikaxunojunetinor.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/23157889889.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/melijabuzipak.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091204574473499.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/dinuzugolosaparoje.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/36125790847.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/52529485768.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/ludixiwowuxesuga.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/towup.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/70050260343.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/jowarametararina.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/37099437299.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/82848662449.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8b57ef2ac---rudavij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+become+beta+tester+in+play+storePDF 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_off0000ba41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA41 10868 bytes
SHA-256: 3215b008c92f0d266a62a8dec5d256b8a65d58038e1e842e0bd469293dd8f65f
font_01_sfnt_off0000d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 17268 bytes
SHA-256: 091a2b40bae82cb628df343d7f5dc3af1816915308373a8a89107df6defe2686
font_02_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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