Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d3343fdb5fa894…

MALICIOUS

PDF

75.5 KB Created: 2021-06-20 13:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5187dbfa68e5ab3ef220ae7a9ece9553 SHA-1: b50615fe0e27bf18919e1ad0d04b5c0edc517a68 SHA-256: b2d3343fdb5fa894f00b5539c4a7339dbd9eee4efea6e6860dc01e3702242cb4
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's used to distribute further malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be6b8f23fd3---60995138152.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/67648052299.pdf
    • http://aryajob.com/user_upload/file/76845456246.pdf
    • http://portalcom-b2b.es/img/user///file/_0491503001621879225.pdf
    • http://carrozzeriabosini.net/userfiles/files/lujarodilozejaziviwori.pdf
    • http://hotararicedo.ro/files/files/misazipazoketazasedeteku.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c951797e716---sovumoxurilidarujal.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/23389215306.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cd73020e9---kokosaxevatanojed.pdf
    • http://dlikefulproductions.com/clients/875850/File/bubenedadad.pdf
    • http://hsi-international.com/ckfinder/userfiles/files/nuliroremufadobelova.pdf
    • http://www.tobywells.org/media/fckdir/file/xemigunorovinegu.pdf
    • https://cissud.eu/uploads/ck_editor/files/simixowubolaro.pdf
    • http://northcity.rs/slike/files/19000256634.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160846f2e39ad7---feramujivirepofurudeteman.pdf
    • https://vieclamxaydung24h.com/upload/files/26297583594.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=perbedaan+vsco+x+dan+fullpack
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f6.bin
4c17b6b155f8d745be197cd6354ca471a98bcd79c7c29325a8a78c02508645e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 5484 bytes
font_01_sfnt_off0000f6b3.bin
822c06315394c46b7100d533624988563de832b807823539c8806d96b582b22e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 13440 bytes

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