Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ecc69f2491bf72…

MALICIOUS

PDF

106.1 KB Created: 2021-06-11 18:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 76e84534f67a14f3fa737c1260db9624 SHA-1: d1bbc8ae955b8e2a3758db7edae9bff091948cb1 SHA-256: d8ecc69f2491bf729b545f0d155b190a1dcf70a34185e35b0296bd7b1a287f36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://oniceh.ru/uplcv?utm_term=jai+ganesh+deva+mp3+song+download PDF link annotation
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afac77c86e8---xixijulewobeva.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e98193a2c---kelimenufavitil.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/1203214439.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429071959155.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080f9f052797---59742700845.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/2520535069.pdfIn PDF document text
    • http://kleiberit.ru/files/file/lepibalokewumovovuko.pdfIn PDF document text
    • https://belloverde.net/emailer/file/fosovupomufev.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d0d40729d---xevebinegewipakobusibo.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/3ph7fp0c3ogli58nltsfhe5puh/37709613192.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/fakosananikasib.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/5570564603.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/65e1208977d3728f9f0fbd1963e9d2c9/zoliguxitigazisutikusezi.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/mefalakaja.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/rupakosowutenowuligemak.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e022511674---35741823626.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f457da6d31---69011426044.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/70798230781.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/340325657.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12654 3928 bytes
SHA-256: 41c1e61fe42e45097253f6344946ad287b81f68e3fe4e58f6036cebb4473258b
font_01_sfnt_off00013483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13483 5580 bytes
SHA-256: 46ab416211312489bf587774e579a2d50285d45db860477920f8b9f0d7447597
font_02_sfnt_off00014770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14770 14832 bytes
SHA-256: be13924d1d7988c20fd612e12a7b86b512b54d42ef8f954317e23a39d69f3913
font_03_sfnt_off000175dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175DD 16060 bytes
SHA-256: d26390a1b495fc4844790f49287189703365677ecb3af67b7cca25d146cf5ea9
font_04_sfnt_off00018aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AAF 4048 bytes
SHA-256: 7a111267bfa56b6925896b1b3422743187af714be5a609f2ff6c06aadce30236