Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84789a14ac198dd…

MALICIOUS

PDF

92.3 KB Created: 2021-07-04 02:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a6cd861b3ef9abde1406b3bfd221420 SHA-1: 2ada2d19a447d14671eef994e54297bcca96f8f5 SHA-256: b84789a14ac198dd939855072a18b5bb87d9622fbf6d9e938b6850820e5832e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or facilitate phishing. The presence of multiple external URIs and compromised CMS upload links strongly indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://archism.ru/uplcv?utm_term=bbs+2nd+year+result+2075+with+marksheet
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949ea19867a---32917850415.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608e19a849e00---95252403524.pdf
    • https://steklo-shik.ru/userfiles/file/jupaxufetu.pdf
    • https://foundryindia.org/userfiles/file/89145370783.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609172fb035cd---29323734483.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b18b28b6f---rapuvi.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/7os6leae7t65bjujlhpqunga27/83719247657.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831a3aa6588---moloteno.pdf
    • https://europartner2.pl/uploads/75842104954.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/74063704176.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160870102466b0---10261794199.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/45a483e4e2dc66ccfdf44f1c326a36a3/fodifireno.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607a575cb91e4---81424833016.pdf
    • https://novahealthclinic.ca/userfiles/file/rutuvoguboninuzasinevaxez.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0b1f963323e8067eda220079c5dbbff3/kabuzuzeferogefapopazo.pdf
    • https://travelworld.ro/userfiles/file/mipexuzirawixagab.pdf
    • http://minerva-collection.net/files/files/77137865507.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b467a0ca1f5---gonate.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080d4e35f913---25046838039.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c49415f9---metururamipanufos.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ab326adb---movajelumufijevu.pdf
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/21578745502.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd8ce1749f---bepololozaxovonavun.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0f232c31e---govigivojadosuwope.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e49d51da1---72906121416.pdf
    • 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_off0000ff84.bin
57778bbcb390bd4f2b448ce8bcc69d257a423150f48a681e85b105fca7dea471		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 18444 bytes
font_01_sfnt_off00012f02.bin
7b7cc6ac3fdf0275ca0bc77b70b48f7f83cb69352447b936bdfe06de5e3e3908		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F02 11404 bytes
font_02_sfnt_off000149f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149F4 16792 bytes

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