Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cee32a52f03fe9…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 01:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9689b5dc3b884cf4970c54d35508acd9 SHA-1: 2bb67302ac22e6cc3497fd9694f06c64fce36177 SHA-256: 86cee32a52f03fe982db9c382219ed55d67299b8fe6d1e52badb277296764e99
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a mix of compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings support the presence of external URI links and a link farm structure. No scripts were extracted from this sample, but the extensive use of external links suggests an attempt to lure users to malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://oniceh.ru/uplcv?utm_term=new+shindo+life+codes PDF link annotation
    • http://naphogacomposite.com/upload/files/winevolegusejalubokuz.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/76161224786.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7b66aac76f86973d625718968ec7726/dilapod.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/bonam.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210912141957.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16135afb915950---3349585478.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/mogaziput.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613607dfe5843---nuropo.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/85279958382.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/titoxujovukamutum.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/10744327511.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/tanatakinevinevujuxeje.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/12367263199.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/lenufo.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/10310164404.pdfIn PDF document text
    • https://limadelimon.com/images/file/xitewapogopimeregi.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/bexovozasebufi.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109150845047852.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/baloxegajojavifu.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/vazonalifuwimibiposutadu.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/79228705839.pdfIn PDF document text
    • http://prograsifkalip.com/files/92688309513.pdfIn PDF document text
    • http://rts-3.ru/upload/files/61094304927.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/kexagavatozobu.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/nanuxabuzexete.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/lolujigeladaxurejo.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/49671421862.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_off0000cc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 17364 bytes
SHA-256: d1d734c591716848c4f3b72ee408e239e944ffd107ba39ae8b4dba4f5dda03d8
font_02_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 10276 bytes
SHA-256: ea5e97b3185bc0cf8dbec51c4ec4be1e24528045eb08f6a31822f828206b4a12

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