Malicious PDF — malware analysis report

Static analysis result for SHA-256 11597352bca02c63…

MALICIOUS

PDF

107.1 KB Created: 2021-09-06 04:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f57d68d567ff58ae0abcba0b4c197072 SHA-1: ca47487b3e5fc364604ab735cf79c1ff173883e3 SHA-256: 11597352bca02c630812ed83d289120834f926d7655039f3ad2922b8279c9849
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/nolariseratefiki.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h5k2ue537l12ppaivhj9p7sh23/nugiza.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdecd6afb3e---17976480215.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61278dff9c---jotajefovamusuzikoko.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210527100451.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/44456734407.pdfIn PDF document text
    • http://gdaniec.com/upload/files/51169063588.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/kalalenenisuxosilo.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5da0e0fa9---19143462275.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/952e0b5008ac96384e01f62e610789a4/wedesol.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c9aac83ca---93350200989.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/givebo.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/gilorives.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3de0d610b---72878114344.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/nikisabawinexanek.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/98518590228.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/gujizotetenubafalilam.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/lapijodiluwokole.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9fcddcb3---426215674.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/xaduxodekolamokiperux.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610a289b3ef07---84042815791.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/581cc56aeb625dd97e5b020c31dd59bd/30846022823.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b43fe19824a---68285277395.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/68763924617.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912224d66de---gemiponaxabi.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/84922816130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=kenzul+dua+kitab%C4%B1+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 17384 bytes
SHA-256: 5afcb7d3a19fecbf0b3a387341943d907ad4d447d81ef2630952b1cda6b7feae
font_01_sfnt_off00013d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D83 19336 bytes
SHA-256: 93ecf654a8cd02f118af4c530abd62fea68a661a6f19519f64b7f21ee3586538
font_02_sfnt_off00016d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18531 10532 bytes
SHA-256: f8917f8d512c8fbf4624e5847b4c668d1db0f388e8bb458016e955effb3d9dd0

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