Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c4005f35195f27…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 08:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88b2a41e34c669c4434506f7a15c9814 SHA-1: 42cd60f3803a6db4e002f375831d11339ed8494a SHA-256: 20c4005f35195f278b8c1f838b0e07dc76f72d8aae2151adff6756a1ad10f486
124 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or manipulate search engine results. The ML classifier strongly indicated maliciousness, and the presence of external URIs points towards a potential download or redirection mechanism. No scripts were extracted, but the overall structure and URL analysis suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://baozhaopharm.com/upload/files/24896870085.pdf In PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/40016121782.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/porukakubopom.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/33801478100.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/85487563799.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/791f9a283cbe153487679f1b4028ab6c/46553653895.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/kikaxeroxemawinezorabit.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/gaxarixopixaronut.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dcc0c5df7---55031986766.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/lotozuvano.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/14996673936.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/zeguxaxaratezamuzejoxakox.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/zafijidato.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/suwawamizigobetax.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/xonivutexufa.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/funetoxotezibotefov.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/18684344273.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210914100917.pdfIn PDF document text
    • http://vhktn.at/images/content/files/23685788157.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/70125818034.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/xototetotaxajezeveram.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/vifajabulawa.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/tudizarewigibawofikab.pdfIn PDF document text
    • http://biomehl.com/images/content/files/pegobesedoxenufiko.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/68730824065.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/25f8161bfd59f9ae58e47b384147c967/zobojepedikujiwoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+to+ebook+converterPDF 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_off0000baf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30B 17000 bytes
SHA-256: f1d59a17556ac5008171aef3d414e1eb5c8177d9efd23dbdbf85a869dad3a8a8
font_02_sfnt_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 10300 bytes
SHA-256: ae5a573e535347694a3ab1bc8a62939fe692387e23668338af751aba3500ab96

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