Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea7ff33f36c8cbd…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 02:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ba12de09bab19420fbc74a094b33d7e SHA-1: a1557f4b44c223f9a16ee61a572dd0733791335f SHA-256: dea7ff33f36c8cbd90ada2564c20c0b1387687022b9de49b9f4f5ffe99484ebe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b329313f95e---403271009.pdf
    • https://autoradiator.mn/uploads/ckfinder/files/52908299193.pdf
    • http://fujavietnam.com/images/Download/taviwos.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb88ba3bf---7079715359.pdf
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/zutigawibugove.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7e8e0ac81308e6f1462f7b8ef09584ca/kajinuda.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e1cf841ba603ca6a8aad4094107fb29b/39301328168.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c61ec8ffb---mitulifemizesakub.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba437c3ec---11800818568.pdf
    • http://aircond.md/upload_fck/file/990653767.pdf
    • https://larustt.com/upload/ckfinder/files/57182454217.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a17838e882---siberetulupofosikes.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b451430134b---bamatofivaf.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba45934cc5e---16562824373.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80d4e2877---reradurufarizakipujamo.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0aec1c429---fosawamo.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a27da125e1ad214fc64abb09e802b583/muwala.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c220966c83c---18901439092.pdf
    • https://alshamiltrading.com/alshamilfiles/file/mumorosoja.pdf
    • https://gikguamerica.com/userfiles/file/44716584920.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/bc11c6570a7bfce2a3092ac2d4cca608/budirudutanin.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ab22a8ede65---sugixisav.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a63b82fd4---sexonul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dave%27s+big+dogs
    • 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_off0000f2a0.bin
fda2219633915892e7f25d2a4fa11fc5571f99c0453a3bba95cc13f4b2cd6377
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 10316 bytes
font_01_sfnt_off000109dc.bin
9229a26513fa3f377cf831b790dadc45acd2a288dd181ca0a8a39557d827b871
pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 16512 bytes
font_02_sfnt_off000134c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134C1 16792 bytes