Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4d6e990d2585e5…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 16:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 265eebd727aa3cd5dbef89b5a7049ac9 SHA-1: 53d389f1304b4094d627774b75cca76c7555fc66 SHA-256: 9e4d6e990d2585e56ae074b8c4e8de9d59409a9ba78973f26bb44a3f20206e3a
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports its malicious intent. The document body is heavily obfuscated and appears to be metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 5

  • 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://catamma.ru/uplcv?utm_term=contour+lines+geography+definition PDF link annotation
    • http://rpsbchamber.org/editorData/file/50809511897.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/verowumijipibiji.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/61733355246.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/31856681862.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/bivagovomodoresexikana.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/jufedojukozuraped.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/q1483e4admbsmn8r3mdabgo7e3/jojawosipi.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/bepefogekojemiwu.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210914_D0D3A6F2DBB8326C.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdcc0aeab4---wumimuredagibekaxukuze.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/53133137634.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/kamagedax.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/vadusugo.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/powaponosor.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/bixoreduriwur.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1631286364/file/79214318850.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/74659874261.pdfIn PDF document text
    • http://agavietnam.com/img/files/37064070402.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/58908627856.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161350b6fa135d---kalojusedoziwite.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0eeba704---60897638935.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/r0al9aa1jksq7s30t8cok05msr/valigosoti.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/30162396210.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/82177087056.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/xaferebejepu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132bcf74ac9e---gabadivezonepuxi.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/xavovuxikunaw.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_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 18064 bytes
SHA-256: 11a63b021d5a0f036cbb8b8b016caea05bbc07ad5383644203045047a90930ff
font_01_sfnt_off000115ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E16 11020 bytes
SHA-256: 840b1b073d596ceb970e72e42fd8f5afda785592b936ad81644418de6293aa7b

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