Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84eae838a037de1…

MALICIOUS

PDF

90.1 KB Created: 2021-07-31 16:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abf0fbd85a1d765e3b6c28ecc91a826b SHA-1: 37ce8664fa7dfa3e83ae93befa570418aa4f7c3a SHA-256: e84eae838a037de1e9be34de3b062b51a939eb9028c7bb8b64523ed8a592a2ec
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160de5512bfd9e---44480737066.pdf In PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/fuzijodizasamopotixunelu.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bb7f628c3---baxuliruroja.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/jujowudakiwabatofovonijum.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/svu2glabpmdlvdp005uhed4u40/govavejuvebopagopukub.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/7fc4fe3f731639e6e2c0801ca4c43ffb/nofofebudevodebi.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/joxupejulowu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca19f1646---46164938445.pdfIn PDF document text
    • http://st03.it/userfiles/files/98016987042.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086175e12500---73911202612.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/6todd044n491v9rah4ca5gvpao/88823148155.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609024dbe0cbb---17575784241.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/wivakevomajo.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/0s4lonnnaat300fhtoesbc5phu/41643940321.pdfIn PDF document text
    • https://teamcode.net/upload/files/41992126558.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/16902297415.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6075117a0---5171223287.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/konaraxugaxekatuxa.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cff27ae69b5---rajobabepofifosegolu.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/lunuwipopemapud.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160de59fbaa101---rutefemopino.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/44117404079.pdfIn PDF document text
    • http://newo.ru/files/files/27651604876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+scientific+revolution+world+history+shorts+2+answer+keyPDF 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_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 16388 bytes
SHA-256: d1b82ae38ec8f6b468b2c494a1997a6a216fed0845f541088692dabafaa23e4a
font_01_sfnt_off00012757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12757 11116 bytes
SHA-256: 3aa41350eb6a8f3e3d1387ceb07114b4920736d8a0aaae4f99a097ac4617444c
font_02_sfnt_off00014163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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