Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa03ecf680e0aec…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 06:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ea320016e3c9094fa82ca8c872b9784 SHA-1: 3920c33eebed027ba4ef2a23bd7e33b75a84a3e7 SHA-256: 3aa03ecf680e0aecdecbec371d1ef767e179746875ddd32fdac712e93c0835f0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on potentially compromised or disposable infrastructure. The presence of multiple external URIs and the nature of the hosting suggest an intent to lure users to malicious or untrustworthy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://ohdiabo.net/images/ckeditor/files/87167896313.pdf In PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9fde0e1a---90797650159.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/sokixixiwibemoxe.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/netefazefiruzabegoxun.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/44884665958.pdfIn PDF document text
    • https://clove7.com/userfiles/file/jelawop.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/dowokekavamosisu.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/6566620704.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/jaxuxesa.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135426cd3e92---37591056087.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20219372927.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/nifatipewugogirivudimodem.pdfIn PDF document text
    • https://e-room.co/userfiles/file/bazixag.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/71445311901.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/88803004855.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/64337869073.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/49652564299.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210908123749615205cmlnr.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/27972227748.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/94692282803.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d60411ad53---kariwubivanul.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/75785941463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=dia+movie+download+with+english+subtitlesPDF 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_off0000e4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 10988 bytes
SHA-256: f4bf24368ad717c4e9c8f3496fcd3b1e4ff9b910f6d3480bb3710d464ec24d9c
font_01_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11634 17432 bytes
SHA-256: cfa8537bdc5ba6a8576b343f600c1a808eb16a5864cf974e2f262f1dbcd0e27c