Malicious PDF — malware analysis report

Static analysis result for SHA-256 7666587a778928aa…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 05:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e12b9d1c79aefdfdecc46ecb83e1582a SHA-1: 3e8501bca43f2ca95a1428992dea6a1a904c6e51 SHA-256: 7666587a778928aa74152db071fda2b511b9bd3c64465bd9b898a2f48e16ab49
104 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the lure of downloading potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb9f0791e5---govibubili.pdf In PDF document text
    • http://3xlove.com/uploadfile/file/sabemasivafinogiz.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/39648948446.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/fewarubi.pdfIn PDF document text
    • https://akvaguru.hu/user/file/24421997301.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/xoritapanezaw.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/74530345980.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362bcc96ac0---14868409468.pdfIn PDF document text
    • http://remobudostol.pl/pliki/62948253934.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/2401001840.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/bimefegezorur.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/fosipupemuno.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-3/20210903142606386920.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/jowuvoduritunudezuja.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210910152430_pjyj8g.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/96176359917.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/758599940.pdfIn PDF document text
    • https://ewt.cz/res/file/vilubonej.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161333c3b84303---tiviwobarepiwad.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/kifapavamivodisifofagubu.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/33009302385.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/jowogofodukejifibi.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/88578150815.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/eb748d2cffb3189b135a27fbf3940dae/nozubapori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=naruto+storm+5+mugen+androidPDF link annotation
    • 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_off0000d8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AC 10756 bytes
SHA-256: b080229ebff07db4ee7c9b8440fb073327d1e596a759c1ec5514459ba18313a1
font_01_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 16876 bytes
SHA-256: 38144edf5ffe24a5a601ff28f1aa24a63bce22023e6f816caa42d88b83285214
font_02_sfnt_off00011cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1