Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d28102aa8995706…

MALICIOUS

PDF

90.3 KB Created: 2021-07-28 12:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3e5be82861988a7c1f2f78b0d5672058 SHA-1: 673eec8d7b969ce879263bd79f977ddb1904d58b SHA-256: 6d28102aa8995706ffbb16a1086d380a23764e66003cc9de6a6788cb816ae80c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/fb1f2a3ec3737c71f7743c10012256f3/peduzelumewo.pdf In PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fhbv5h1vlo9a7jpc11upvlua1f/giribineriwemupuzikavuduz.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b342c473172---86848468836.pdfIn PDF document text
    • https://csn-alliance.com/data/files/85364467957.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/fevasurelowixasitera.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075a702d6879---kiwomanike.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a8134629f---pefitobisilexe.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b121b96f281---59858898303.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b14b2b90a---kenalipux.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/mijebujipire.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/segiwuj.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/37038804485.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3259f806434093a0dfef0be8119c2d49/ximolexuvir.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d221a983159---fobilolijosorusudawofopa.pdfIn PDF document text
    • http://abwrva.com/uploads/files/67674822987.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1a6cf5912934db791f6231da6f623a68/83309945027.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/negodogudexavesegoparular.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec510d9997b---feragivujosoxu.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/22857294002.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/dewomadukajo.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/fe9ed1868fa43d48ace5b5be82dbeb69/boliforikamokakazegazu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/064fa16a3be77603931f472c364d9c07/34435781225.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2800c583f8---mopod.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/75521173878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=physical+science+grade+11+module+3+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_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 11336 bytes
SHA-256: 4c2b88345760bbee4d4aa1e607728739067aeab496edfaa636fbf6d426dd81d5
font_01_sfnt_off000111fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0E 18612 bytes
SHA-256: 65aa196e82d68e89693d9a7deb800ae4bdeb98c0a9061cd538ec2d623500fa0e