Malicious PDF — malware analysis report

Static analysis result for SHA-256 7004f2ec084ec280…

MALICIOUS

PDF

87.9 KB Created: 2021-08-01 22:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 93c1c6a56b7f82fad265841a9f855001 SHA-1: beb89ef8b142a4208d29ad317267f4a1d2d207d9 SHA-256: 7004f2ec084ec2807ccde43a333bb0165f43119ab3fae4875c42c16621aa1294
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous external URLs, some pointing to other PDF files hosted on compromised WordPress sites. This suggests a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3cd7146a1ecb65bd8552e2b86503f289/41658328405.pdf In PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/luzatuxigupekevelavut.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/pogojolemarizixezem.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fcc49cabc6a7e96df9f3427bfe340f73/folovexexizarolanir.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b26c1d8de9a12250b5dedaa92e39b0f2/sefobusulimileni.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/78589009060.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/55185480395.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/95160810038.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/pepubasufiporugekifu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ca6b27444fa6f5e391e3a606373b2342/fepepijej.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/botevekudate.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/zexiwe.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740ca6e542c---nanimerodasu.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/kokorulaj.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/942a54fbee44f624cac3ae7762c6a611/norajugabixavupugivaw.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/86091589731.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/68608994879.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34a768f2be---werujifisudevuleko.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb01108766f---57377428560.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b895dcdb77f---kevasoze.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcedf3c0b11---67086372669.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/28713973460.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/a81034bf9789900be009db2689dad3e1/45103533736.pdfIn PDF document text
    • http://skisun.it/userfiles/files/mikokepokunosevutelu.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/fameguzujizife.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/12949200259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=construction+health+and+safety+audit+report+templatePDF 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_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 16848 bytes
SHA-256: 43826a5aeef622cd7642f48c53116f03aacdc5a0b51aacffd2bb1593a82eb850
font_02_sfnt_off00013746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13746 11132 bytes
SHA-256: 1aef53be56da76d4d623b728bd9ff82398281579110fbe91bfa04f24a46937f9