Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8f79dfa2e012a6…

MALICIOUS

PDF

78.0 KB Created: 2021-10-04 17:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9046b28f857a99c778c1d33f176dbc90 SHA-1: 0c94fd92f614407d1c82bbf07d1bd39d7a637fe7 SHA-256: 9c8f79dfa2e012a6812e9667bc1750dff5f35701a91846c31423094193af3ce7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to PDFs hosted on compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=sky+blue+color+meaning PDF link annotation
    • http://neoneofytou.com/ckfinder/userfiles/files/99373609193.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f9ce7147d17d30de04ab23d074ca8983/24467080111.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613189587ac35---86233175855.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/61177543316.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158a716a7235---18833395903.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/30956113907.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/56638268971.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/munorisejizafod.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1dde940eb0730d1b5ba8db40fe6120bc/64756700968.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2dfd647ba---16732396171.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/24658942899.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b0e8653b6964456315f039ca73c9023c/newegawikar.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/wudanurovawikaminofi.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/df7m8ljj5fic7cirmr3h61hul6/21193623286.pdfIn PDF document text
    • https://seger.cz/userfiles/file/66094109249.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa4d7dfe2---xisaraselefitifovi.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/3596181831.pdfIn PDF document text
    • http://letdentalab.com/img/files/seduxutipikami.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/tezefanurufimapa.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/tavegazerug.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/towivodu.pdfIn PDF document text
    • https://demoliman-host168-com.twbiz.me/data/html_editor/files/17943089220.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/penofas.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/54504092739.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_off0000c978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 18324 bytes
SHA-256: 61d267943ee6295690c7946589ec61d372b27752761f25593641b8f896cd9b68
font_02_sfnt_off00011194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 10828 bytes
SHA-256: 38f039b902fa113500e5a9fd0a214ac5e3b74abe129d82cdaeb223e27307ab94

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