Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ddb805d733f467a…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 16:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 19a6d351f634786d8467cc1ee510665e SHA-1: a24dab69c8367fe67253b32ae5f1a816588b163e SHA-256: 6ddb805d733f467a53861b9eff967eec63636f19306d9281aeaf6fe5d7b5a65b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as compromised CMS uploads or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://aihyang.com/userfiles/file/delunafepagaloxinixufab.pdf In PDF document text
    • https://aksusu.com/upload/files/76754270284.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094d829cdb1c---zakiporawifabev.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/xulukepiko.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160e58b7aad058---99533329604.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/rkfgtiaa5nh793orjlqg0sbjhv/redefe.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/nobuvulanapovop.pdfIn PDF document text
    • http://chlahb.com/uploadfile/2011/new2011617/files/2021/08/20210818070724.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0va3fqi4fl41p773lme19gdlam/xewujakojitin.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/22126234749.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/woxikurezepib.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/37707576807.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610559fc611ec---39361346840.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/71d13bc920322d71d0e7c91f7cb496b7/45048201006.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/klp2q123h7ldg57gka0oq5ft6m/regokavewesuxibuzewosal.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c1dd0dabef8059925155988a0c890e92/75502266888.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/6ce180909923827e63a8f17530287630/56926637960.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3ce5238e---boloxopugu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e86d526b9ad76a993de04621c45a631d/34409713245.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087130ff389c---52280534382.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/lugasap.pdfIn PDF document text
    • http://o2ashop.com/ckfinder/userfiles/files/zisezapamunagogokewape.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/pajidadetejezi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b1acb163e23dc9e98bb6b323a6ccb678/xatodivepuvux.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/17548700612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=o.t.s+watch+instruction+manualPDF 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_off0000d281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD281 17272 bytes
SHA-256: 6fe5cb4dfc10dff368966efe77258520fe5de9ec1da447edd885ea29b4fca87d
font_01_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 10640 bytes
SHA-256: a3649e187f86801b40a071b9995594029fa090b87e2bfc427c978c1e390cb5cf
font_02_sfnt_off000117ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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