Malicious PDF — malware analysis report

Static analysis result for SHA-256 867bb224c2269a13…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 14:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e6ac8b2761e94de1e9c809877c30cdf SHA-1: d98d524da9235890b40e1b36b23fc86ca47c4cc5 SHA-256: 867bb224c2269a136e3c68090339025038675c708189e65e16506753986f634a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple distinct hosts and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 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 http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0de0414a1---naxifogekasufipigafudegor.pdf
    • http://salt17.com/userfiles/files/pamefobizojudisu.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59b38992b---27641118776.pdf
    • https://kabelkyaobuv.sk/editor_uploads/files/nenugenulifaboxuno.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/luvibowakufonirobopanuxu.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/gm9vgdj7vfr058p391b96917b0/ligoseditetipa.pdf
    • http://murito.fr/ckfinder/userfiles/files/suwufilox.pdf
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/76650487792.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/2bo731e20o32esd778qdntq4mg/lojizusotidijiximelive.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070126c410ae---36433410415.pdf
    • http://www.lugashotel.com/data/editorfile/42421904601.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa980f4b508---bezepazikujemogef.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160861e5903564---39775829085.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160901dff595f4---xifodesomivewulutibagedeg.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/dilalimem.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc8491957e---ruduludalibuf.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d742a9712---61204906972.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7fdce4b3---25579081613.pdf
    • https://amblamy.ee/upload/file/5747962146.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b2a77f556---7263498688.pdf
    • https://ottenburger.com/userfiles/file/98581553398.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b0567e232c9---lujusonedosidusawepewivil.pdf
    • http://ayurvedicclinic.org/userfiles/file/soleninavomevizewe.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3de864ef44---faxewavigoxege.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=does+basal+cell+skin+cancer+spread
    • https://medlineplus.gov/skincancer.html
    • 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_off0000efec.bin
c13be331c0b36f2a1d08940520916b8c1f9f3d1297b04f5b33c2ec1e1923e0ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 17448 bytes
font_01_sfnt_off00011d43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 16792 bytes
font_02_sfnt_off0001355a.bin
c013fa2395fca82527ec78bbb7e5a93196eacaad842bd2e24b987dc6d3d4414e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1355A 10644 bytes