Malicious PDF — malware analysis report

Static analysis result for SHA-256 3441e23da3878de7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 22:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 592fb4c2ee34852a4e942e705b376eaa SHA-1: 1df28d0fb9dcb6c453f93bcb4739a1766fdf621b SHA-256: 3441e23da3878de7ce260ae362b230ceb89333c322d96b21e43eba90577963b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of external URIs and a link farm structure strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=best+calendar+reminder+app+android PDF link annotation
    • http://www.physedu.in/newsite/userfiles/files/vidobupazetapalufuwav.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/81493260494.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ee9cb0c27---73672948978.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/taremoxa.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/99382532343.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/91067804498.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/panorapekewazusijuzufapet.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87572027309.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132141bc0c10---30302250721.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/61577111658.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/vonata.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/ripusifimoretutijasamob.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/60374983010.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/8045147434.pdfIn PDF document text
    • http://creationart.hu/files/file/97310768802.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/84268037619.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/70535265638.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/ruzojubavirapolonosaroset.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/lisujalebilivej.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/betebuvojirusavebi.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613870453993b---76307068639.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/balomerisedoxor.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/kezozibijilufi.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_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 10728 bytes
SHA-256: 3ad4766f7a29e49f9dd1f3d75550d64e3a0cf4a8dbe254cb75a09d4132f10627
font_01_sfnt_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 16764 bytes
SHA-256: feb8ac87c5095911607bd5805b51e3f001eaec32c66495e6177ca8cc6ece449e