Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8c3f6dd6584d44…

MALICIOUS

PDF

91.3 KB Created: 2021-09-02 11:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b938c550c2dacbd894d8c4d832771d39 SHA-1: f9d24bfb67656e9092b7366f7fc632c30f305c98 SHA-256: 4a8c3f6dd6584d44a5e2b174fa39df53360ac7d48590d446321f5d8b8dc86b4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 6

  • 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.
  • 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 http://terredellamagnagrecia.com/userfiles/files/zuweketetevekemulimuj.pdf In PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/larenorufos.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/56d55mtij2orp5gnvhdmq0fq89/45335542212.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/tazavuleritijetusefotopa.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/88397993441.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/22303181182.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/magexunepisikufeduj.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/jegomarududaju.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f5081e2fc---40791373333.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/nafodokogopabezisagatedop.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/50425145199.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c52a1b188eade62e48d8a13c8335deb7/wovabexi.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/278181702.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/74389171899.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608536f8ae39d---69343927809.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec2745589---59687193916.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160789aeff3ffe---pizipoxadosefe.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf63c679b0b---45374280087.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf07529ee8f---sagogapuvepomiduzoneguv.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/95837539864.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/78055453012.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/41157775941.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fadff1e706---sefigunikudivivube.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/5124046129.pdfIn PDF document text
    • http://slsnn.ru/content/file/94364323417.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/suxumikojebibexasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gujarat+samachar+newspaper+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012be5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12BE5 17632 bytes
SHA-256: 68679709210a13be05deda384503204960e4d0f8748d3515020bdbf8f750d1f0
font_00_sfnt_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 10984 bytes
SHA-256: 9b49695b7a7b5a595abfb19a688fb6de444d09289c781092d5859f89ba74b60a
font_01_sfnt_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 20128 bytes
SHA-256: 790b14ea176039759fda976ab0b269d2ec7c8f922d70c947660d1d9faded122e
font_03_sfnt_off0001470f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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