Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b34bb32ce4a184b…

MALICIOUS

PDF

80.0 KB Created: 2021-07-02 04:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b85950f9cf01d2901526e6cc55233dd6 SHA-1: 1c6204bc5f56923c8420eb04a951d2baff780424 SHA-256: 4b34bb32ce4a184b2cfbb1610ae4fa99531ae88cdb693bbdd8d86cfd11c349f2
204 Risk Score

Malware Insights

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

The sample is a malicious PDF, as indicated by ClamAV detection and ML classification. It contains numerous links to external URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the PDF structure and linked URLs point towards a drive-by download or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • 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://archism.ru/uplcv?utm_term=autocad+to+pdf+software+free+download
    • http://jingluo.net/uploadfiles/files/88973689611.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b83aa2f6da84a3ee57a946b9e6aa7414/pajozobizexogedagi.pdf
    • https://aquatrustfina.com/userfiles/file/90757606829.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb876374f5---tilokujewinuxozosikat.pdf
    • https://alihuata.com/userfiles/file/12145135913.pdf
    • http://sparkpro.lv/content/file/38627556880.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f676b55850---14721000489.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876d624b57f---fureraponifepososeti.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cba8edf95---fanotekonibulopukamere.pdf
    • http://pivotal-technologies.com/userfiles/file/dozevijuwimudobojonusozak.pdf
    • http://ourhkg.com/UPFILE/userfiles/files/1502062877.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bd13845b9---fekoxiritomidumimodiduril.pdf
    • https://bio86.net/fichiers/47609640993.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/7cku2b92hhe0sa3a6vdnmte5a6/gamobavuvusututepurufik.pdf
    • http://carszana.com/image/upload/File/54687398808.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606efda0d152f---80684332769.pdf
    • https://btsis.com/upload/ckfinder/files/gukujekofo.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d00bd70ee2f---tawepajejabumupate.pdf
    • http://coyada.com/up_images/up_images/68087366975.pdf
    • http://aroma--style.net/files/files/tewewonetoretobafu.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ig3i9fnm6a8jt90t10j96p6th5/7587547085.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c249f16b0---fifosi.pdf
    • https://cafe-malaysia.com/contents/file/xonudukoveb.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c17a7e97efa5a09594ac00195a1a7310/keretivisesivofuzebeji.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d594.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 16792 bytes
font_01_sfnt_off0000eda6.bin
673acf7ebaa9886baf41aedcecdd320ee052ad4dabba0fb51974d389eb01bf7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 16932 bytes
font_02_sfnt_off000119cf.bin
f041f63e2cf76001f0c470be170329be06df621070e6d032708d70805a3e4845		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 10688 bytes

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