Malicious PDF — malware analysis report

Static analysis result for SHA-256 27874b83a8280f75…

MALICIOUS

PDF

90.6 KB Created: 2021-06-26 08:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 202e3bfaac592faed80d14e24d3be240 SHA-1: ca83d9be1dbde7ed3d923742bf47563b4bb8880f SHA-256: 27874b83a8280f7584e2b2c97be64f2127f4a3d9aea8001c219343e642d20213
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or part of a link farm designed to host malicious files. The presence of a 'download button' heuristic further suggests a lure to download a payload. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=drw_trial+license+key+with+crack
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6ma3igsqcm7fvupj6gncbgc003/7545679221.pdf
    • http://wildpflanzen-planung.de/file/pojusa.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/se1t1915nvvctuhej8olfr0e2r/ganefabubeze.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/butudinetojorov.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b30963832---84238884933.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mfqh09mo8geo1kfol7c3419rss/pazavapifivaxepifapib.pdf
    • https://arrayamed.com/userfiles/file/nulojujev.pdf
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/xuginipigegoxenulimigos.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/ec999ca3f2a56bed69f9dabbf2919602/wojilewimepukorikawam.pdf
    • https://aplusadvance.com/naver_editor/data/file/kofuxemilufi.pdf
    • http://geometrarontani.it/userfiles/files/muxedibowuxojerovud.pdf
    • https://aspirans.com/files/file/94498376295.pdf
    • http://amctop.com/board_data/editor_img/file/202106181846.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071dc89351c4---fubagexojixiwo.pdf
    • https://nepalonetours.com/userfiles/files/zapokurure.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/v9q4t6i0noiago37dpk995rrng/78110565486.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/xivogowixoledes.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a004a7a189b878efa5da04425d4cd745/talotuzafimetajaxojuxex.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927abaee910---saxonegemumifibur.pdf
    • https://cabsfromheathrow.com/userfiles/file/32982607606.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/7gi9s6i5e8k55bcia62sebi0ad/41334378412.pdf
    • https://travelsafeway.com/userfiles/file/96147546195.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feac.bin
854dbf415762b8d12b0751e8e70bfe5102657c10e9e6f46009ac09ae45a62b8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 10532 bytes
font_01_sfnt_off000116b5.bin
e12463120551d3e6e63042537fd17d4ff15bf3521d770cf0b7c5bdc699bf9be8
pdf-font-stream PDF embedded font (sfnt) at offset 0x116B5 18024 bytes
font_02_sfnt_off00014533.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14533 16792 bytes