Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2ad0b5341356d7…

MALICIOUS

PDF

95.7 KB Created: 2021-09-14 13:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ace7131e50d28199d17b0528bba03cab SHA-1: 199c87f2595846bdd98517a4e1dc51ae5b80e56e SHA-256: 6e2ad0b5341356d747e9a408134c0fbdc1dfd7c22036fbd93592f391624af438
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents. Several of these URLs are hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140081c584d3---mupokafituwejatitof.pdf In PDF document text
    • http://trevorhannant.com/gupepotibeletevumip.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/daxafupisumixuxe.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/logukurenuluzoraw.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b2f9eb68e---gajetu.pdfIn PDF document text
    • http://amandamaitland.com/images/file/40580338058.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/nogetunipexoreli.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc3800acd2---pujosesitut.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/55256868949.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/97076486016.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/93525955489.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/63581233585.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/32870535653.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/genanegikokalimaxunane.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/minunezuwusowumosevufe.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/nomezonogapaz.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/lokopeluwuxo.pdfIn PDF document text
    • http://ipublicity.cz/data/file/zobupixutad.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/lujoruvokogigetox.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/64645666177.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161338e39dcfa4---29718349527.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/97932561788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=live+space+wallpaper+windows+10PDF 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_off00011429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 10692 bytes
SHA-256: c9e8c3dca3cf86b09d58de5119387291a2e798fd60400820a93b907f7f7e7e95
font_01_sfnt_off00012cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD8 17428 bytes
SHA-256: 112b9f4051a4b7c790dce5fdce9e87776a53461a9645fdb59d78b7e501627cce
font_02_sfnt_off000159ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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