Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a31a2a2cb9b8b8…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 15:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 96d31f1b2b6a7af0edca69a92d062144 SHA-1: 8f14b6807ab80790f71ea87fb66bfb9f833f291d SHA-256: 27a31a2a2cb9b8b8565cd92a698e495612b5f7689e4c00fe7cfd63de7d96712f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the presence of a link farm pointing to various PDF files, some hosted on compromised CMS uploads, suggesting a phishing or malware distribution lure. Although no scripts were extracted, the structure and heuristic firings strongly suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://netshopnepal.com/userfiles/file/tuziwivorelul.pdf In PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/11312987907.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/gitajefulorebenav.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/laxumukis.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rakiverenufaj.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/pazavudowupegi.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/sepejaluzesebewekesunovig.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/getez.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/42955247756.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/tomebelabetowe.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/folikerobixisubemanixig.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/20370497582.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/19909131318.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/67056892012.pdfIn PDF document text
    • http://enricobarraco.com/files/peduridasagarawofode.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16130300ca24a2---31843423412.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/kagadapit.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dotixuvejigerarisejexu.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/27365988586.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6132AFF789BA3.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/462cbd05034cf7b785a44af7012b7cef/40157092624.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/84969181586.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161381380a5c12---83691568679.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/22223359286.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/30966041087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+ball+z+shin+budokai+cheat+codes+ppssppPDF 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 11184 bytes
SHA-256: 2f22dddc5027e741b0819a45e94894f8ad76e4f01f09ce9e95d56c7187ce2931
font_01_sfnt_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 18348 bytes
SHA-256: 1b277e98c5102dadb5a3b9864202340289083973fe1971e877aac4f787342de9
font_02_sfnt_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1