Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62dec5ce17251f7…

MALICIOUS

PDF

89.9 KB Created: 2021-09-17 06:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 29f13ab980a740503913846cc2911c88 SHA-1: 6730411cea01e073fc469a72f95b30c82677719a SHA-256: f62dec5ce17251f754f7ee569ffd4a6ac19382eb2720e8bd46b5273363a378a1
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The heuristic 'ML_NYX_PDF_MALICIOUS' strongly indicates malicious intent, likely to redirect users to malicious content or phishing sites. The presence of multiple external URI firings and link farm indicators suggests a campaign to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://allytemp.ru/uplcv?utm_term=mx+player+free+fire PDF link annotation
    • https://lawyerupsmart.com/tempimg/file/viweruvevefemoremob.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/698ff4ed37b9b4cbccf60984e3b5285d/zososeparuvufufamezuwep.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eca7f5630b---31679204325.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/cd6b940cf2c7a45764885ca065ff58f7/depuwofoz.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/zebazelet.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210903163140.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/58504327239.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/memenevikukixivevisupin.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/fimul.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/95933209989.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/jazufemuwemabewugijavi.pdfIn PDF document text
    • https://arendic.cl/files/41574777001.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/wopemowaw.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/88059004016.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140bab5c2d12---bojagokupomebuzerikusako.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/56666850261.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/zodovapelofujagaxel.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140840125372---62119965628.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/668a77f5d060289bbe774a2ff6b14288/deroligage.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613336fde8d9f---79765258263.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/zimilipanet.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/gelowategatawitomipu.pdfIn 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://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_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 10072 bytes
SHA-256: 3a867b71a9384b9ab8e568f5a2fdeedf3c6301a6e9b11c3b15883b2ca3982fbe
font_01_sfnt_off00011153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11153 18576 bytes
SHA-256: 34b007124c45eb4fbb0072a41d5f2b80a2d89c4db7434a519da72a060cb50db4
font_02_sfnt_off00014214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1