Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b013aebb01b905c…

MALICIOUS

PDF

87.2 KB Created: 2021-07-31 03:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4364b22082dd63d0526baf472fe43f23 SHA-1: 8289ffb91a6e12a61cc9b28528e6ac07e65a9136 SHA-256: 8b013aebb01b905c6bc96564ebb1aa756a4f6a935510290f99c7df1b279ba807
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many pointing to compromised websites and disposable domains, indicating a likely phishing or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. Although no scripts were extracted, the prevalence of suspicious URLs and the nature of the heuristic firings point towards a campaign designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 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.
  • 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://alnahamgroup.com/userfiles/file/jazuveriditefozos.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609655d144d93---pikesodeduzinog.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/c7eddd33ea9afad05fa448f704e19f1f/pixelosojagogewu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c653ef85069---26527241260.pdfIn PDF document text
    • http://stevis.cz/files/file/47467678087.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/39818258573.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/36663669329.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/gkekhppouv7boe6db71l7mgt82/danuwamemejefajuto.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vhu5cdt2vetgqk14pmd9sjgkm2/xolemagezusibowixinoparaz.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7a2173dd8378d2689f529c88c2609cf6/35826807216.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6e053818---13645764864.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5e3a72aa1---72964628172.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/81767416736.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/3924678714.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/57691245415.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/fm6u1albchcahukfda4fi5vjkm/bujevogixekexesoku.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/peroraxekoludejabubax.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/35558049192.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/0f7090341777b9f2e81567c4a1ea997b/65613631188.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160828b9e56f7e---40389624772.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/75345368070.pdfIn PDF document text
    • http://envigest.cz/upload/file/suzivenezoputuworefo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d95126651---lakizezunemapexubegimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=expanded+form+worksheets+grade+5PDF 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_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 17856 bytes
SHA-256: 8af3be096f41b27b485b0bf58742daa56c1c6dd00b539770cad6bf4fad864f77
font_01_sfnt_off00011bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 11204 bytes
SHA-256: 7115dab915681c3da2be8d8bca257a1c22d80aab3fa8906dabb05283ab791085
font_02_sfnt_off000135aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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