Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7e01a2572746dc…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 00:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e56f8ce383ff5199d8e2ba598bc69289 SHA-1: fbb4938ef2bd0e869b3158807abce24d5abd05af SHA-256: 1a7e01a2572746dc1f8fbc0696994a16814c92ac1bb1623171d14eb4bc4bb5ec
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16072e34048e23---16470541702.pdf In PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/q4994r9pjg53cki715rlm3hk8q/kipod.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/27539990144.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/17939865176.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/71464647607.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/1d31d1af33148376cccaa37631ffa0c2/vudozaxagiwesupano.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/16171875814.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/sodifizugudikete.pdfIn PDF document text
    • http://isgsrl.it/images/file/foxup.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/afkc9fv70gthdrucv85vc5478e/zajakigefaxefereluporot.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/2p0nr3oh6e7c7q6delmtt27j52/53637221818.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/jivibugusoxu.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/49365971895.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/21415588437.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/1155650815.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/35745748526.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/duvidamatatopene.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/govifokadonemolakabik.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba849619626---49840161767.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/vijubigawe.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/29337204301.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/56533227070.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cfd8b051d---59673271333.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613228e5340b3---tagunatadila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=biologia+celular+libros+pdf+descargarPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09F 10884 bytes
SHA-256: 1ca4849b79d215c7463483c32071e9a57f63e2af82d6284e9a53d4e7f4f6a772
font_01_sfnt_off0000e97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 20260 bytes
SHA-256: 202ee2c5a3472d0643496a169b38169f4cffde370f3153b0ae3bf45e29c18a18

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