Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b38f44a0d3ffc1…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 23:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 78b183c854b84f4f4f13689b2a5e2117 SHA-1: aa809cf0b80b0ed7d554dd19478b7139ac513bc1 SHA-256: f2b38f44a0d3ffc1b871f4c89d8e1127e8367dc22980a419c553a637031641b2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various websites, some of which appear to be compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://sapporopools.com/contents/files/92753449943.pdf In PDF document text
    • http://kirakuramen.com/uploads/files/24365544453.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613368e2764a9---nejexusigiwevo.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/gufezerubojovesumulidarew.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/zazaxe.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/rifaw.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/pisorasovem.pdfIn PDF document text
    • https://polaria.cz/images/file/zagilesudugulolo.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/55785450105.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/58059601.pdfIn PDF document text
    • http://airsoft1.ro/files/file/puvuvimejur.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/vakemetuna.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b00354678a---gabogowaxotewetoveker.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/poruvew.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/48530639889.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/53318773141.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/o2j6c75bf2npsn3fmrivhant43/39484525693.pdfIn PDF document text
    • https://equinox-e.com/upload/files/dibaruxamujowugezewogakas.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/lonisodagibemewa.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/92474350897.pdfIn PDF document text
    • http://totoumi.jp/upload/file/belozijonezivojuxigonelu.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/sorazofufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pdf+watermark+remover+software+free+downloadPDF 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_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 17588 bytes
SHA-256: 729111cdce568ce13ac850404e2f0e1d6f2b24addebe9741206bf79bcb398db7
font_01_sfnt_off00011254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6B 10668 bytes
SHA-256: e775a4b0a8faf8f0ec0fccfff49b842c7d7b5fbe02a2fa7aadbe05a1fe50093c

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