Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62bcace6cfd0494…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 09:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8b25cea1880b7361f54a6a1f89c4ace SHA-1: 8af4e23d69219030d028824b79d62eaacd5d1e2f SHA-256: c62bcace6cfd0494ae252470075ad9fc389f1fdd252fdc87b4f68bb6cc2c6765
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=pokemon+red+apk+gba PDF link annotation
    • http://e-menu.hu/editor_up/gelijolibibefegivali.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/41904267136.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/1322439340.pdfIn PDF document text
    • http://partnercable.com/files/neverodizinipug.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a6fe8b48d68c172c6b97c57764fb8861/23603613032.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/sepixonug.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/xinixipez.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/pagewiwu.pdfIn PDF document text
    • http://hingliltd.com/userfiles/xonadatavuniguwi.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/gufenexudexu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/7389ae04b11d552686505388f36ce936/44975267406.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/26092470977.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210906092126.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/lulawitaseliwemadejix.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/8037561316.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/96010574857.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357dc629022---savez.pdfIn PDF document text
    • https://grandegroup.net/files/darixosumitar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337f2e68dba---silanipuxewezugaxa.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/930706156145e3fe1ff79.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/koniled.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/o7i6b2piicov6td1gffa00ael7/6153265671.pdfIn PDF document text
    • 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_off0000da84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA84 17844 bytes
SHA-256: e448250afe07a36cb798185b7c4daa1d66040df035f86eb51541452a68931c25
font_01_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E8 10564 bytes
SHA-256: 8ef73fc5d55628146555c357a7c1ef1c5ea3bbb8be1fbfa337dedff9c76c60ed