Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb93b3b3b4cc91bf…

MALICIOUS

PDF

140.7 KB Created: 2021-07-24 17:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 70c512c34884eb4260e6c9fa5382f7c4 SHA-1: 6eace111e6c934ba332094404d72072040df704d SHA-256: fb93b3b3b4cc91bf5d10c57605dae5b34b128e2029ed17efbdd354b04b836558
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links form a link farm, a common technique used to redirect users to malicious sites for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec7547acb---vakimav.pdf In PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/54075872321.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf8fa4e0d---60206048789.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732e8bc9195---keladegerotiweju.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/93026669959.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/78fae7820be132ba6057f09c3ac3efc3/95220872155.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607492075aded---7589974914.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/85041891022.pdfIn PDF document text
    • http://codefon.hu/js/ckfinder/userfiles/files/dumidivularawowuso.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/54766100297.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d7b13d4a---68489485013.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/88h7maurifbsqr3vg531e795po/80517969571.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845e56cfa26---nasotolewazisowirav.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c43a5fb40ae---84294976254.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/1ntn05bbae63mpmgv4aa15kjg7/nemajotoxibikopafes.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b071e090cd3670404e86f9166ae535eb/lixemidoxijobibozorod.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e499468ca---54050952901.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/91725535058.pdfIn PDF document text
    • https://limmaginebistrot.com/file/35209800418.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/nipeturafiko.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4f9b704b8---gamomoj.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/ec6596585489eb14ff32cb0d85d5f85f/fetebuvinabojufetavikop.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/1r0devm696rq9sfbo1c6a8akli/suxofipunadofafirutupad.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/sejugitelilobedopa.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/3cjojaqikl1mtk8m6392j6h1c7/kuliwogozizuvexebe.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dab6192e6a---juxasunolas.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/c2jcb3pc2lnodeoqncqparpt0b/dowoxerazinoposabola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=western+aphasia+battery+test+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/sorasevexosu.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_off0001bf12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF12 10676 bytes
SHA-256: 687e636c49f97e8c4ff7904dcd15fe840d2c660c6fd91297f7bb73661e85403a
font_01_sfnt_off0001d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D744 20456 bytes
SHA-256: a294cdb77a9b990437541a90ba1e6d2d88ad355897ebabc85bdb95628ced5021
font_02_sfnt_off00020b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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