Malicious PDF — malware analysis report

Static analysis result for SHA-256 105cc3ef3a8a3542…

MALICIOUS

PDF

125.2 KB Created: 2021-06-09 03:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ffb47f2c5e998c9517a4c7410e9b99d6 SHA-1: e0dabfc12668cab5d865b5be63badf834de345e5 SHA-256: 105cc3ef3a8a35424d4790bfde6493c5a00999a2e8f64cbffb5a4daf47890e15
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and date/time information, which may be artifacts of its generation or obfuscation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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 https://nomylo.ru/uplcv?utm_term=my+hero+academia+season+4+episode+24+dub+online PDF link annotation
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a91cd6aad---24046841030.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a98h59668h3lmccu30sl7v5387/47152757251.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/86e7391158e9afd52f53b5b70f5d2b15/jorepamivumu.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210607082335.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/gupupukoz.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/51288753034.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/tt9t384ca9qra00ira14aua1f2/51676778717.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/20385328020.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae9056f4fc---90471910918.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/22542934123.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/bukeb.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/10228066689.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/969d30f5371df77370cfeba97554372a/jalusedek.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b470bf316eb---kibetizi.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79a736178---99724212349.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/k4gnsf0pv7kjsp4s653sq3v852/61786326113.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f61a9fe2e1e6b82aa8b05cba03ea6cdb/70166134120.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001203e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203E 33152 bytes
SHA-256: 961292adb313ab164196729c82da203a28acb81b2d333b755236f9a84e15a192
font_01_sfnt_off00018652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18652 5580 bytes
SHA-256: 247a759c59825484b47a5b17a5035efc613b4962400ef196f068905b74b0d692
font_02_sfnt_off00019923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19923 12816 bytes
SHA-256: ee765d1972f3f4f7b89fd798d03d30823bb6c44052fedd27276855ecc210a961
font_03_sfnt_off0001c248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C248 16648 bytes
SHA-256: 422c958d7fbab81b9f4b85aead9ccda46a1b9d0653361a1d11c389a2757511f3
font_04_sfnt_off0001d88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D88A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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