Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b533d047c11c5e…

MALICIOUS

PDF

71.2 KB Created: 2021-09-20 11:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6702793f94d52b4885e6194c19506018 SHA-1: 057cc2084e54be8d569c57e23a47e46a5c9c1c6f SHA-256: 54b533d047c11c5e857e2dc621ab85055bc4734287edef6a4a4323f50751eb17
156 Risk Score

Malware Insights

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

The sample was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on potentially disposable domains. The PDF's structure and the presence of numerous external links suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://zuszdounky.cz/files/wesogamejakosuroseresi.pdf In PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc0ce8fc29---jerin.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/fc631e10fae7152d2bb6906ae2292f2d/boxunuwesonikegu.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/3849649230.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/rarubalisunumuwepakifir.pdfIn PDF document text
    • http://afslab.asia/upload/files/gopomakawujuribi.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/gokimejoweriradete.pdfIn PDF document text
    • http://fitviewer.info/files/file/gedalabu.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/sojuwagikakemo.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/80769339645.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bc33237eeaec7022884c203053c940ca/59355965195.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/99095856994.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/32741894593.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/topavuzutanof.pdfIn PDF document text
    • http://cpils.com/userfiles/file/pexitoxagunomo.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/deteraxaka.pdfIn PDF document text
    • http://laserinnsbruck.com/static/12928368139.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/munisutejevaduf.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614251815e470---somozafiganevo.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/55363331203.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/34832457116.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/10662419847.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/6049365631.pdfIn PDF document text
    • https://kede.org/userfiles/file/30455670885.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/728c3abad51f56643a851de8c8db6ac6/35913407213.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614701be1e2e4---54017377977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+snow+leopard+pdfPDF 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_off0000b739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 15572 bytes
SHA-256: 46e79dd439606b559a72465efaf627b58255f20d71e7647a502af420d3370a7f
font_02_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 10452 bytes
SHA-256: d1e3c9af89dd70163faf0cdd874301680d145b2f857355bfcb39ce29041e7dc2

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