Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba669455dbd08b83…

MALICIOUS

PDF

83.0 KB Created: 2021-06-28 01:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0dbb269dfe5ebe96c613e0bcfc032d3f SHA-1: 884fe3813455aefb0cbd2fe9ca8ece759771c4e7 SHA-256: ba669455dbd08b83215a36bf6fb7e0d5f8f2898df47a2da5edad2c41eaff5a8d
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised websites, which is a common tactic for phishing or distributing further malware. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/2tj6j09mo4sg4cpeemk2s54phn/61911547646.pdf In PDF document text
    • http://centralgiving.com/media/userfiles/file/rirutikuxuvizufetafedod.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc6fcf1268---78536013933.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cf80e0102---94447218108.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/sonojubaz.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/lomagodunusafegexatu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a0c136d6d---seref.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160beeafa61f55---jitem.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e0e8b9e8a---91340786604.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xodonezu.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082816705b18---zefesox.pdfIn PDF document text
    • http://aceranalitik.com/ckfinder/userfiles/files/vekagowuvuvefejegedojavi.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/9187d7e2ab6c6537ba0d9052c21a487e/58786114820.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/pigesixulutamu.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/pogitomotajidit.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/96248632688.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ae4ea866d54841e55b8ed38ecf17d347/rigomawizisifafog.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/futewigoduxi.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0230f7cef4---21022545438.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/73811711204.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95859391d---wuxolosatalaseroridupo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a22aa694c---noralafeso.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/26166070020.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/69899393823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=puzzler+crossword+answersPDF 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_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 17464 bytes
SHA-256: cf0692aea96742884c1f12c6e7de23de60607fedafed0c8fb8cf64fb925defb0
font_01_sfnt_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 10420 bytes
SHA-256: 1c12df3768b8fb86aae747048a0f928a4e2ba986d9767f3040af35c94268f5e1

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