Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c307b639595c5a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 00:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 42d5aa4205d1a77e9fe66e4c810f729b SHA-1: a2d02b21a9162f8033cb9511c23777de6b47a65b SHA-256: 03c307b639595c5a8927b294a4631b93de4223fd17a5dac93d0e5a6d59c0bc14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload locations and other disposable hosting sites. These links likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71174ebcd---gonuboweselu.pdf In PDF document text
    • http://resumesfromabove.com/userfiles/file/17136609806.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/69805502747.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/boxabep.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210602004954_bmltYXRpbGlkZXNhdG9rdXhlYm9iZW5l.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/222f912c76434c232367a108e24807a1/11445009049.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/55634366546.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/50244235270.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af9df0b7441---vuvogajubezibim.pdfIn PDF document text
    • http://toyotalongbien.org/data/dulieu/files/posopuzozopimasejexede.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/bojebigamujexorawejiwe.pdfIn PDF document text
    • https://aspirans.com/files/file/sekogadepelujomubimatofol.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/77260495191fd0839e68b77ec4ac3e6a/38348851798.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0db0587c0---jusubewu.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67373493010.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jtnkjk3csg97sm4d9vdeokq558/31687943666.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/24187624916.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610da126bfae8---mijizoxupebirunuramaku.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8eb3183ecf---87829386031.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/figanezofim.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/tenibugojedadekopaluri.pdfIn PDF document text
    • https://baongochoa.com/upload/file/gikas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=oxford+phonics+world+2+teacher%27s+book+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_off0000c0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A6 11316 bytes
SHA-256: 6af61daaecd1c6915c6dfefb3cd6fb2b383c50afa49a4c6b79833052ac9e213c
font_01_sfnt_off0000db27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB27 21140 bytes
SHA-256: 0ddbd0e01834758b6324fe8aea497932e3928fb54e6f07eef74b7f1510531a67
font_02_sfnt_off00011015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12826 16392 bytes
SHA-256: 509a8f496b473dc92d4927d2c2432953723c32fad341bbedd69dd062e81a1269

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