Malicious PDF — malware analysis report

Static analysis result for SHA-256 20160fb086941f4b…

MALICIOUS

PDF

87.6 KB Created: 2021-07-23 07:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e752343eb0c6efed7888e8bde4b3f2bd SHA-1: f2ec3d7cbbf717ae3661de53f0c56f404f544f85 SHA-256: 20160fb086941f4b047eb81479dd5d649e5f69d075705ed7d31f33eed9caea24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress installations acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users through these compromised sites. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d67d34f6a2---7121803307.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/6kji75oqefdch73r9qpn4i0blq/15162545291.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f67802678461b935ec7e95cb435c7631/lazoxetiduva.pdf
    • https://eghamatkade.com/basefile/eghamatkadecom/files/80931620427.pdf
    • http://aa-nusd.jp/80404440854.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098335d1ee7e---jefosimalutaba.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c87qbcm7qv9ene4kqmrsv1a9v0/nulisaxotupib.pdf
    • https://groupburuemas1.com/contents//files/lasefevaluku.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160934a8a28a07---wetapuzuki.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/52420365506.pdf
    • http://controlsystemco.com/cache/fck_files/file/30179723729.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82c8cc7340---momoz.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bd5590b2c---25707276388.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d70e03f1---215314424.pdf
    • http://bannermaul.com/userData/board/file/63108566917.pdf
    • https://daiichigroup.net/uploads/news_file/wujuxaxurofuzowux.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609471ead3409---88714283904.pdf
    • https://sedefartphotography.com/resimler/files/guponaj.pdf
    • http://cichanski.com/Upload/file/5838592404.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/603df298ed310a1e3e51984638cc2b7d/zipanojisin.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/50186370867.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28f29e91c---77306908578.pdf
    • http://castrolmintabolt.hu/images/upload/file/51201823326.pdf
    • http://wsp.pl/userfiles/file/48328840190.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=direct+mapping+cache+calculation
    • 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_off0000f104.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 16792 bytes
font_01_sfnt_off0001091b.bin
ea0a047c78385aeedadda8985c6524e4b733f9e0216ad9b8d2dad50549927e1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 10752 bytes
font_02_sfnt_off0001219e.bin
0e847c2101c649597a35e4e0152b95fb373f21b46153b1bb9e51c810aebb8d3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1219E 17852 bytes