Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccff8f3d5ee4348c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 12:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a68dd2e244a91b636a684c87c58af80f SHA-1: 318945ed59857baf70e61209633b8643c8f6d215 SHA-256: ccff8f3d5ee4348c38f2dbb51e146154fd25eb1d62b7dd5a48f7516d9008de04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=dream+league+soccer+2014+data PDF link annotation
    • http://123podkrovie.sk/editor_uploads/files/7453875219.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/zofowulabapoburusawixuni.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/78019470623.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161361dd9d07db---popeso.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1b9b653fdd294eac63307aa7a5bea38f/90358906017.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/rajovuwokudagozanoga.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb5f021858---60804955105.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/nabodeti.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/53990155681.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/18306935108.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/parelowim.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/xoviwewofefumejumidi.pdfIn PDF document text
    • http://bastola.org/userfiles/file/josevoselemixazi.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/xofiw.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c1263572ffc74dd361184375c1ff85e7/kemasuxodewolemapupugoti.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/wopomemubawanuxup.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/lasezupololanexazo.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/139502494.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/jovarujifavuwesaza.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f3b402104ddf0f2f4e90d715ab67d658/46251887963.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/fodagezidafupivudo.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0ffbf1b884659f66491126a050101698/redizufawedejukatawuwubel.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/14535431804.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210902223307.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/lajad.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c389d7de011b8d2b58342f11df2b0664/xefabuvivejomakofovujefob.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/datejanidir.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/57248173513.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_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 10988 bytes
SHA-256: dfd46ca86095bec4f61adeefd2ae3c8d34e4f448f152fca6b52918b0e97face4
font_01_sfnt_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 18636 bytes
SHA-256: cdcd8168163cd1077c340a92a4144ec69a72ac53760fda74e3a24a1c57ac1f48
font_02_sfnt_off000127fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.