Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50abca1ec48e1f7…

MALICIOUS

PDF

84.0 KB Created: 2021-06-26 19:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a1834d84d24e55cee27bee4271df079 SHA-1: e492ac4599f789398b4a9bd4c8aa72f1037178f5 SHA-256: c50abca1ec48e1f7ebce6dd3f77f6a0c33e8cc1d9911af17f1348011f15a5838
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of numerous links, some with UTM parameters, indicates a broad phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://casaatlantida.com/userfiles/file///20940911101.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/551a7vlpl1co88m1n1i65163b4/33208184861.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/0c41556048b8bea21c1dbcadbfe40c13/59997849566.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mibuzigezu.pdf
    • http://wisdomtours.net/upload/file/tepanevesalonogevetasi.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929592ccb4a---pudojuxopara.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/rosautopc6phtg05t01mdvrd9s/32292983464.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079b2745d802---woviwakalorizet.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/122568917.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074af12d444b---43966576905.pdf
    • https://ivanda-commerce.hr/userfiles/file/paronelofome.pdf
    • http://biotop-zamosc.pl/userfiles/file/xixupojuregutujugunut.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a15bb8eddc5---23319489864.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/80d7ec379f23deeac093c4c3fea5c951/lanewililamujineniwa.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6f9cee408---31908006701.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160912c36b9f74---sajisakibaniwajusekalozu.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7744fb68b2---pesipimawiwugakavogin.pdf
    • http://talleresjpg.es/img/file/jexumigifubul.pdf
    • http://wo-kop.pl/userfiles/file/wexurabonerafeko.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083262490496---wuwub.pdf
    • http://hitecds.com/userfiles/file/7088016571.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fed6e3842---dedozutox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+earn+riot+points+for+free
    • 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_off0000e69e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 16792 bytes
font_01_sfnt_off0000feb5.bin
51215273a0211216b61aa6db841d562d0fc7344cbd65a8044217c246efe21df1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10384 bytes
font_02_sfnt_off00011658.bin
698d7b3c93771e8df58e0fa51e30b45bc4dbba6463ab7a6bb1b0ca8588a14e26
pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 17072 bytes