Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c7be6566de8e40…

MALICIOUS

PDF

86.5 KB Created: 2021-07-05 18:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8b8cee1337f2c2643eb03984fb8b98d SHA-1: 51674521a375be4e0cf6730ec89d43c4b1f329cf SHA-256: 77c7be6566de8e40a661248332110250bd526d2e6a0f1d5e7ac79c6dd17a7ff5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be redirecting users to malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://sunarchegypt.com/userfiles/file/32824944537.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7c15f41e1---pibulokerajo.pdf
    • http://bogelaipigeon.com/upload/file/jakaxojujixegup.pdf
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/28908266879.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f7c7e88ba---38904482609.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160856731b9e00---numagifopefusekasigej.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b3c4f8887f87c8c1fbdb9dd61dabf79e/17940944265.pdf
    • https://pioneerlift.com/upfiles/editor/files/38893184568.pdf
    • http://gapoom.com/upload/fckeditor/file/58603183207.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabcbf86724---nelovefixefuza.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608458f65123b---lumugamabipokozesixod.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f062076989---1631208439.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ea83bc36d---jajinujizonovuraler.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/m01i5hsu59gtlbpr777b37tupp/gifajujawalid.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751476cac49---29106517595.pdf
    • http://aklond.com/UploadFilesfile///2021062619562313.pdf
    • http://shengnabei.com/uploadfile/file///2021060817484725.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac201f6dde9---pitefixu.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df41c595e0---namukagukuvilozux.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b374570f731---gudufanom.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea66c46ab2---55019436576.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160811bc7378b0---notubikikapod.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dol+starter+connection+with+auto+switch
    • 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_off0000f03f.bin
63e98b662bb967ef136c52c1a9c296ea911958af427a0387e99fa6b03ecec71a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 10516 bytes
font_01_sfnt_off0001082c.bin
fd5d9a6130397374463538fdbc4c21d5eca26b53458d927c3fff3fa292e6c6f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 17228 bytes
font_02_sfnt_off000134f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134F3 16792 bytes