Malicious PDF — malware analysis report

Static analysis result for SHA-256 7626f4608cefcc26…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 15:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 404f028ed49325a9bbb8ee1d4588fab4 SHA-1: 820faa8b9839aaa4b534c945e9cfd8bacaf8ee2a SHA-256: 7626f4608cefcc26928136ee1a084d1444dc4469bb4d8814a524feea958a06ad
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farms, many pointing to compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document is designed to direct users to potentially harmful websites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=minecraft+beta+apk+for+android PDF link annotation
    • https://legyenegyjonapod.hu/userfiles/files/3483541673.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/rerukogejumunidevoj.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/72205201871.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/wuxex.pdfIn PDF document text
    • http://sinners-party.de/media/file/39501643005.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/dedeme.pdfIn PDF document text
    • https://tsolisp.com/files/file/86228768458.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/bafigovonoreweni.pdfIn PDF document text
    • https://gangnampools.com/contents/files/66977522725.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/kezatukafolowazuj.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/33984517934.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140f7b3d2590---66949303629.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/jokinigiga.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5ed213a464199607e35306a0aa746447/92122250369.pdfIn PDF document text
    • http://mweb.cz/images/file/fewipexosufiniv.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/66fa1802a44f4988a7e25a744a7361a1/gazerenomaveb.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/47709816879.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/pazurore.pdfIn PDF document text
    • http://videocycling.info/files/file/26004318695.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109140914463587.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/71033536214.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/1915828311.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613787904bbc3---zemuxumalejutotoxetufexo.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8383b85091511940b4f604efba5b145b/13122339907.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_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 10624 bytes
SHA-256: cfcff361b60f7b7fe9dbb1a4e02a6d966f044cd4052c31920b9b95ae5576150d
font_01_sfnt_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 18604 bytes
SHA-256: 576e5513e8ef9e36753b70462145b4e2529ef8d35f9d2c801c81351bef54c1df
font_02_sfnt_off000121ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1