Malicious PDF — malware analysis report

Static analysis result for SHA-256 873e17b5d698dcfe…

MALICIOUS

PDF

87.4 KB Created: 2021-09-03 21:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0673323301a6184f8ef81368dbbe7ae5 SHA-1: 1ff8cd6e13f2c2ed2ef7da4f4d12332134ceae60 SHA-256: 873e17b5d698dcfe90fd5659129e88b73e1da7b5ddae684cb559ffe35addf785
164 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and other external URLs, some of which are associated with download lures. The presence of embedded URLs and the 'Download Button' heuristic suggest an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=xerox+phaser+3635mfp+manual PDF link annotation
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/8eb5a98538e83a2401553ef2bf5fbb1e/53023214218.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/30682109335.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/mubudexubiragabiv.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/7955860811.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/7jehjlv6l9hjociip0luqkek34/816762143.pdfIn PDF document text
    • http://innotack.com/userfiles/files/30396412420.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/39228705252.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/8489108380.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/dikumanofoke.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/46906623109.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/df30ef757289e0ddc89e9ea2a1f71a87/junoxu.pdfIn PDF document text
    • https://waroproject.com/file/86252542340.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/zudutil.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/36662995804.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/rivutubo.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/20633962219.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/662d7a71829b4111ec571be0bfd497ec/lusekejadujokusot.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a75fb532bb2---21758183369.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/ruwugitipexiji.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/zixuxilukenexezinipufin.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/guwufedi.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/lisuwojogeguvodejujo.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/toved.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/70978052420.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/74626025690.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612563b6e1e94---melunu.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_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 18832 bytes
SHA-256: ef0c7e942d7c66ace5c0cd0aadfa18df80811f10aab4390a748d5d41d2ae118a
font_02_sfnt_off00013610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13610 11116 bytes
SHA-256: adf1ae94534c2189cf8d3b4aa6163862cb3651b3f010464ad8c5d82d5b9f27a1

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