Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5c2793cb951022…

MALICIOUS

PDF

78.8 KB Created: 2021-07-09 00:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f832af1b516dd094279fbae2158616f7 SHA-1: bc76744b90fbd9bd26a1ab41e39e0becc3e617be SHA-256: 1f5c2793cb95102292a743086e4b7064fadf03a09f6d03032b58a53197a4a2ad
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of numerous external URIs, many pointing to potentially compromised CMS uploads, supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95fa9a6dc---62865158820.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c26fb8780---falimewikenuduraxabuj.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/12ec6e0cd9ffa98e5211d3232660c204/28063439783.pdf
    • https://romalasergroup.com/userfiles/files/60298923446.pdf
    • https://khangle.vn/uploads/images/files/kibupasexan.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4643a3ff9---simirumusikilopixave.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/08b8eb3bc946f22dce45c77f7468d5ba/ziwifuzaxudutezevavobidu.pdf
    • http://glovimex.com/uploads/ckfinder/files/99459260196.pdf
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/jerum.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c621227df---55288524567.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a3ae42c18---xulosuwusurem.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724f76dba6f---xikukujeluvukejamuweza.pdf
    • http://cobe-ing.it/userfiles/files/pijagidubed.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b1e0ae1df---48209551096.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a51fd65f20---54985211368.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4re35bbuqpcih130kdjes84845/39212927720.pdf
    • https://responsible-tourism-alliance.com/content_file/files/98753447136.pdf
    • http://location-appartement-venise.com/italie_documents/files/32568886765.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/37be8f9f890d89687d433b47fc97cd17/20952158338.pdf
    • http://makinsushi.com/uploads/files/kapowuxenetotilik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=at+the+ground+floor
    • 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_off0000d345.bin
b4e1c4c35508e250d20230643eb86b21f2d43fde3a43ef4eb179c6d150346ab0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD345 16972 bytes
font_01_sfnt_off0000ff8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 16792 bytes
font_02_sfnt_off000117a2.bin
d9302d828694168c5c5d92f151aa2c27dd3ad44d559cc70c7653cada26b01255
pdf-font-stream PDF embedded font (sfnt) at offset 0x117A2 10292 bytes