Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76070eb33cac5eb…

MALICIOUS

PDF

111.5 KB Created: 2021-08-21 05:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 766ca800867b487ca413576b3a97d23a SHA-1: f39cc47ecec5aa981f173aa871c19de36fd09b2e SHA-256: f76070eb33cac5eb837b04e284c651fea7c2e0c8cff331fbc12c789dda18f8c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://aarogyamedico.com/userfiles/file/gekoxogaxorolifedaleg.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/64fa73783b594e95c1cfbe2b0d4090c5/solegifulutusajigoxedixo.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lnhrbcsovgv56t617g1f18pjh0/damobekibogul.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d230223b3a---34159593990.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/q790g1uldnc8phkvnk9c59v3m2/wekodazitigajitaxixinogum.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16110687b00e11---raxagojovokekizal.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/wuritewo.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/19631434791.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c22c5442528b5ad92f3c9b2f287d9677/26684419874.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607af52f80cbd---manevasav.pdfIn PDF document text
    • https://willes-gb.com/uploads//files/202108080057475581.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115c86ed86db---raxotik.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/ritutoxitowatigisis.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/c97cb8q5015udcc4elj2u6tcm6/25275720273.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/29137002829.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759cc4cdd7f---55186503608.pdfIn PDF document text
    • https://invest.pl/userfiles/file/duzarunogumavefugogage.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a267034ad6e---gokinajav.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/r23rbbdtt9sqp5cs6dttjt9003/xavimakixugizuxogi.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/e6u3tegpgftbr6chqgmmqc12ab/28907674005.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e795c65be---xudoxekivazobagor.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aeb658d79---fapobolasimununakog.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/00abd6e7d0bf7bf23e420b9abb9297fd/64292395182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+i+download+epson+l3110+installerPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00016042.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16042 18008 bytes
SHA-256: 60b8be31bd2283090d1107ecc7022a781ae9f8b7d6a37682e84af929cb523afc
font_00_sfnt_off0001217c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217C 10808 bytes
SHA-256: acac6bbf7ab9ec5ed1c472e7c060070692d85159d6988ab38017fb71d494d3c6
font_01_sfnt_off00013a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A84 3412 bytes
SHA-256: d23b396d2c18a5e103ff680b3fa9417a9494880ea2231fd2899158b813746901
font_02_sfnt_off00014831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00017c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C0E 19056 bytes
SHA-256: db07c209e0c2fba6e02797aaeab4902cb128e4591c11130ea641171c8908f13a

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