Malicious PDF — malware analysis report

Static analysis result for SHA-256 28acad6c35556f26…

MALICIOUS

PDF

93.0 KB Created: 2021-09-12 00:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee18eb7c4d5b3b5bb422d1b914ca0056 SHA-1: f459f951152e4b1d910bccebdf1a84ba09066177 SHA-256: 28acad6c35556f26fafdc194aba5a59758b1221bfe36420f208de83edfc875e1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting. These URIs are presented as a link farm, likely to improve search engine rankings for terms like 'minecraft apk download', suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=minecraft+apk+download+v1+free PDF link annotation
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/21ad57098feb16b29f8d7a3edbaa214f/ropopufupavisofowifawi.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/95307036001.pdfIn PDF document text
    • https://csn-alliance.com/data/files/38262277488.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210902200901.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/74554568644.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161378e9650ac1---dapunuzotepaxaj.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/runavajilezupatalogolod.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/zokaditusamufutolafer.pdfIn PDF document text
    • http://potya.com/17316595403.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/faropokamorinedelufubaxos.pdfPDF link annotation
    • http://55pluscommunityspecialist.com/userfiles/files/labokizuvinagudasutukuko.pdfIn PDF document text
    • https://mavibusiness.it/file/tasalinixudanijivil.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/5690776301.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210906225836852.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/3179667384.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/52748067836.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c01b1a36e---6987803260.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/lafepitalib.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/lupinibovulumavusulax.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/marinuxirizitakazofasiv.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/vinaxatamififezobez.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ias4hktra7dqfbpb0ug62avm55/fozopimagugojolebefava.pdfIn PDF document text
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/12393308449.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/setamelilimogewuvel.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210907_EB24568F1F2B2E54.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/zotujipurilo.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/58255122828.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_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 10732 bytes
SHA-256: eb90e05b82bc2437465520f42cca77ebff0526e2c129973bfa205bfb8b5a600e
font_01_sfnt_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DB 18624 bytes
SHA-256: ab7094fc49bf262e6496120e468d2c3d27e985d289a69758b1dd6326aa24f27b