Malicious PDF — malware analysis report

Static analysis result for SHA-256 556cc533a2411da0…

MALICIOUS

PDF

89.1 KB Created: 2021-06-19 04:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d2e7a36bc665f7e8fcc146ca16daa009 SHA-1: 1bb1bce020bf0a706580cb2cb61ceb9e424c0167 SHA-256: 556cc533a2411da0da2e08755a5f9926e70bacb8cc1cf6531d565afbe9262187
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://nfc.soo.jp/file/serelupefurizif.pdf In PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9a658575b673fc7df25a46ab0a72b800/manovi.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/toxede.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39c788b78---puwolatofegaga.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/brdmsd7b6877dhne5annmb13ve/jafax.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a5f08fcee---jusidoxojurisot.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/60944924890.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6b00e8d29f3a95c45e87bb58e15b855f/jororerididoke.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/37464251244.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b192585c---wanufitekapijetoxiwobozip.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714eb939714---52675583791.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bb971e9c8569f99a1c376ff9a5fd8cb8/19112783691.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fdc07d28a89b1b57f9ccbcaa58009787/77003373668.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a99631e32a05233e1cf88fb846178e8a/49730194160.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/f74ae57078ae02dae5ec3ae0c8d605c6/milugefewixetokizigi.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/92na8fhb0arqdo3gh86m75rcg0/49261291258.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6306d657e7930c40d457af54be4600ba/47649297819.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/waveserubojadima.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16097b3855c251---37170190220.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=terraria+how+to+summon+skeletronPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 5032 bytes
SHA-256: 7490d6392d8cf17c7c9e07115b874d23cb3782ed8818addef654388d7f3a7b09
font_01_sfnt_off00012e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4A 11904 bytes
SHA-256: c9614b728e89f04779cb14df67f1262d3c6eef03f6c3ef1920ecc6e6d511b1c6

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