Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07d58c327e9efc6…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 16:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 431207cb181a173bf2763842dbccbc32 SHA-1: 67018168bb17ecfb48d2cd0e87e3e614c8900532 SHA-256: a07d58c327e9efc62c9b8ab06390407311ac5996617c27f8768a55e03391aa40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised CMS upload storage, suggesting it's designed to host and distribute malicious files. The presence of multiple unknown URLs further supports this, as they likely serve as download locations for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5366e5eb8264dd7843acae15a7682183/94965937684.pdf
    • http://savvyais.com/userfiles/file/16159436752.pdf
    • http://peknanevesta.sk/media/file/povaxutojit.pdf
    • http://bolt-go77.com/fckeditor/userfiles/file/jutudodilafit.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614214cfb471c---66737550796.pdf
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/wowukoru.pdf
    • http://aviatechinform.ru/sadm_files/57922953256.pdf
    • http://slkuang.com/v15/Upload/file/2021941943134569.pdf
    • https://viktorina.ledoritulys.lt/files/21336599458.pdf
    • http://asirakademi.com/resimler/files/28898407038.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/49003112218.pdf
    • http://tks-forever.com/upload/2021/09/05/file/92875806010.pdf
    • https://fond.ru/userfiles/file/mawameniregixen.pdf
    • http://caythuocnam.org/images/files/raxipumumojop.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47c522dec---zugevunikajunerivoget.pdf
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10366033505.pdf
    • http://talk200.com/admin/admin/uploadfiles/file/wadopenasijimoxukebeluwug.pdf
    • http://www.moyekolodin.com/files/49668432714.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc425a6e1---44087906087.pdf
    • http://www.majbrno.cz/uploads/files/23705027379.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+make+custom+widgets+android
    • 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_off0000dbbb.bin
ed843a343ecef822996523ae15e6511532c8cac3341257501750bcfc90b96c96
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 17616 bytes
font_01_sfnt_off00010910.bin
1d90a775f5a602a746eb61b98e78c1f73bc00eaae0471e8633bced8fa5db2b74
pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 10936 bytes
font_02_sfnt_off0001223a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1223A 16792 bytes