Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb31b05a54084be0…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 11:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ed6045a906b606c526018012fa288a11 SHA-1: 1521d78e936a5e3b6ebf973f096f0ebfb5069f5c SHA-256: bb31b05a54084be0c0861a5035a975875b4b1a8c32640d1e1326b62403d92536
164 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on various domains, many of which appear to be compromised or disposable. This behavior is indicative of a link farm, likely used for SEO poisoning or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://komunalno-vrgorac.hr/files/jerit.pdf In PDF document text
    • https://ms2gacor.com/contents/files/4418068886.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/19618354149.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/140049453060a59798ae118.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa24ee08e5---22633821429.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/6393173825.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc53fefc3c---73372841271.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722db6254fa---74964840325.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a737731c53a---nizujalivisidugatu.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/1620048161885.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91b4adf94a---418344887.pdfIn PDF document text
    • http://slsnn.ru/content/file/wewokuzevodujawisalixi.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/nanoditomowafanisuliv.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/sogijuz.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021062502203849.pdfIn PDF document text
    • http://kes.org/upload/editor/files/zatuxigukep.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/66557285986.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06276012ce---24186371107.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///75029617145.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9de73a0978---wobiwejukusegasunaz.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/korejoluwuk.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/aaf57c96214ab97c8b9c9fc9541ae123/29274502112.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/53530371222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=salesforce+lightning+platform+enterprise+architecture+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_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 19016 bytes
SHA-256: d3225007fe70f30614093124688c8698ca476caa95afae5eae6942d63412d2da
font_01_sfnt_off000115d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D7 11244 bytes
SHA-256: 09135c0147266cb4a728d60aff3eaac309c9f906e1bd42fd0343ee11a7c75e3d
font_02_sfnt_off00012fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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