Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19990e32885b37e…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 11:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fcaf71fd5ee23e9e2fae0c49474e3be0 SHA-1: 3bbbffff544b4a8e3dce87cc6c196df0a40d2a00 SHA-256: b19990e32885b37e972cebe71ada5814a6fcb2847694b5e2e0fa3f348efbf6fa
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The JavaScript likely redirects the user to one of the numerous external URLs, many of which point to compromised WordPress sites, to download a secondary PDF. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/9dcfe6b4c65e7dc31a5402b6e139fb02/gupelugaduxaxebetalawagen.pdf In PDF document text
    • http://albino-pitti.com/pub_img/file/39358102628.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e211beb15e---92085734344.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be520dbdad8---dagukevijodagamolumubi.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/nitelagotunilidokosi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/serenexosonivobixuruwo.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/85531060373.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/obvido2man4uaccr9llj8a77q5/jububikiwuduxusurowod.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160778727c4364---95698292517.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e2e0b8966b2062a5492d85d39c2a87c3/katujiwudijuvefaxoja.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/xuxexavitivularipubonup.pdfIn PDF document text
    • https://chp-travel.ir/data/file/tetebumamewixunoxar.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/sisotajolapukajigano.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/n90g4qoed4a1tvi7s4evlk5qg2/besofeverogekabajaxoji.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/jupozimudizagi.pdfIn PDF document text
    • http://iwishop.hu/file/39154847573.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/0be3711f3ad45fbb8f4465cc51133f61/20778473251.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/57747826732.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/44838439211.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/90070007304.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4d794e26ed1a88e58fd87eea5a00c261/25861390064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=howard+and+guy+lawrencePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 10476 bytes
SHA-256: cb7e2d9b74cd4c1f4aa43630a2d93d853382a178b6d55b77934f54dc34708357
font_02_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 17596 bytes
SHA-256: 5f0c393e9d7820d1d556bc06a0252eccb88e27b09b59916141ef4ef4e7890a38

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