Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04534d87cbd28ed…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 09:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6138bd0fe1df894e173ddce154f0999 SHA-1: 9ddec64c742684b4256bf8f3fb14540d5210b82d SHA-256: d04534d87cbd28eda99961e70c6fd325f2d116e6d9bdfae0ccf41a82de5ce02c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, including compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://ashioke.com/images/library/File/jizekun.pdf In PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/fipopa.pdfIn PDF document text
    • https://ratoempat.com/contents/files/magajusase.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/21187552431.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/fubarowixoluxurafogopa.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613214016d63d---4658912070.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/galexelelori.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/jigenilewefot.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/77a244549faeaf70b96440fbe19c983d/25150326860.pdfIn PDF document text
    • http://dongphat.net/upload/files/92623164462.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/batot.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/61716537034.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/89796961287.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb25ed3139---17804967057.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/16892353881.pdfIn PDF document text
    • https://nevisnews.com/userfiles/domovi.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/pipasavoxuzulo.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/butukojababelab.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/60395588105.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/62972239250.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210911160201.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/lefufuxivexodelepare.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/51214571697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+make+light+purple+colorPDF 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_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 17712 bytes
SHA-256: e810c08fcc76db345a3d7fa726a6fed5cc17bc887c130b0cabc6a2617a5be216
font_01_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 10820 bytes
SHA-256: 165115c07f1ee6d37fa03a824656fe3be2cc32a0f97ec14c3fb1714dfdfd38cd
font_02_sfnt_off00012749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1