Malicious PDF — malware analysis report

Static analysis result for SHA-256 4742cc33a9b3f6ac…

MALICIOUS

PDF

86.2 KB Created: 2021-07-19 09:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ffb9e716dbb002ba6052fed02aa83c12 SHA-1: 30e3d6a4992f39f4db4b175db5fec250c7999730 SHA-256: 4742cc33a9b3f6ac270cfc86a69b71f801a8b1f6fe197c6457fd8caa343e070c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eb28cc095---57416188902.pdf In PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff8379f2ca---vebesirolagubuxu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7f5e7ca91f9d518b9adddd4b1099854a/40658675100.pdfIn PDF document text
    • https://ebooksweb.net/files/file/basixe.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/defiwimawajosexuso.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/29134791469.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/eleb0tn9h1bmc7ueluj5cphvp5/bewixifumugojusim.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/tejafimejutalire.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d9895bae0f7a405930e52a39e424439d/zizadokuzagel.pdfIn PDF document text
    • http://novichiha.ru/pic/file/werozujajis.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/gebovifinuneluxubanu.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/bekakajefezakefujedumebe.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/91089660080.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c6e0b90774726366b146ddab1f9653c7/javubupixov.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/rajuserofi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d270bcb0---94820515041.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/jofikogogan.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f4dc5f95ea4---bufepa.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cc247f41f---nabokeb.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202163161525.pdfIn PDF document text
    • https://alutat.com/data/file/2209022180.pdfIn PDF document text
    • https://medtek.vn/storage/file/75466340976.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086990a2e68a---45449904290.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/4357ce1ed8a782e1a106fb1295780f79/rubutalinemudowi.pdfIn PDF document text
    • https://centerfordiscovery.com/blog/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=atypical+anorexia+nervosa+symptomsPDF 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_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 10800 bytes
SHA-256: c1223929b3fe1477d455f38519bc200d55bcd131caac62a5903e02ef0a436973
font_01_sfnt_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 17416 bytes
SHA-256: 1e84d75bb8101ce4ea294f8235596533d6df3cb2d25779183db42a5c66a7f658
font_02_sfnt_off0001334d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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