Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8496e278b7b578…

MALICIOUS

PDF

76.0 KB Created: 2021-09-22 19:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fe309a8095305b13264aa5986af69b41 SHA-1: 02492801a724d5d50d205e0dc1ac59f3c862811d SHA-256: 5a8496e278b7b5781f72adf7d30098f23189d4646d32211c4b7530a034bbd006
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://mp-hd.de/data/aktualnosci_imgs/file/lupojuxazeguwi.pdf In PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614020e0473b9---jesinalugipasitedidowar.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/73322520344.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613269ac990ab---95394795033.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136f72c1ed43---tonupezutozip.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/jodagovumevitog.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/takib.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/sanafelitoxomiwekakugegej.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/zemefibu.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/saxipidesigudigozuxod.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/58436741511.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/70262784260.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161316fdf448ce---kobixunojuragokawom.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/nenujumitefitatowa.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/90184063241.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/vovotuvinilebenosulilebo.pdfIn PDF document text
    • http://esistore.be/userfiles/file/sakaret.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/marunefumafojupepawujome.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/wavadeg.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/51791515742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pc+das+english+grammar+book+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_off0000bcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 19712 bytes
SHA-256: 3eb3503e7be41177c0eb6c14287c7a7b47665283382fcb2c05be117917f0506a
font_02_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 11204 bytes
SHA-256: b84d4761b35fc5ce43cd5bfd51d40f874f74dc831f244c1a2d411b06986f87ce

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