Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e1c912b9e7191d…

MALICIOUS

PDF

76.9 KB Created: 2021-06-13 04:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 442599180fbbb50abb5fe2b9ed06f3d0 SHA-1: 8b0fe39888eccbc99b147cce3cf753eee1aed398 SHA-256: 57e1c912b9e7191dff7b20bbb466fe507ae3f94354aac68fb1ac6dfdb4af7140
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file utilizes a link farm strategy, hosting multiple PDFs on compromised WordPress sites and disposable domains, likely to improve search engine ranking for terms like 'Hulk wallpaper 4k for android'. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading the embedded malicious content. While no scripts were directly extracted, the overall structure and heuristics point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://laborke.ru/uplcv?utm_term=hulk+wallpaper+4k+for+android PDF link annotation
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/f92bacb2c6397a32e7bf187e7175298d/wubikelivatobavixudabo.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160971d8d960aa---fatogasarabokejaw.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/75129109402.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713e70562f6---84130492983.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eef51d6d4f---28589313399.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f7e8153c0ba24d5216d3e4e6dbee0b2f/27684960587.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/8mkd8ck2gs7vi4q7vb68dgg1vt/99667218853.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160978df3cf473---16713820914.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076bca69623a---japozanajarabavepotaxopib.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/52862972678.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/86612808042.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/66fd714d95039cab02670459bd754267/86383961819.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/58484820793.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/32726110056.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16075bbfdb5fb4---gozubibireg.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/een13su28l8puvmp6lop79q6r5/17676017757.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160730b79281fb---mitoj.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/64156649216.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 5060 bytes
SHA-256: 3fb6c00c5c00b6b7bb2eafaadc0289e89bc9219046189de7baaf364c71fae483
font_01_sfnt_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 10300 bytes
SHA-256: 8d7c517d2d5f5526173ed6517afb8b81a7a2447bcfde08bf29bcfbf133d514dc

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