Malicious PDF — malware analysis report

Static analysis result for SHA-256 379c2673ad564f7f…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 23:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 917d99330ab147458b5afac545f4d100 SHA-1: 671e70e28b9fe6c8063f6fa4df4cbc254f997fb6 SHA-256: 379c2673ad564f7f8c2efa1658a6d44b6becfa1b6f4519bb7ac8725a1a1edc8e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, a common tactic for distributing malware or conducting phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities or delivering a malicious payload via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://www.mds-horizons.com/upload/files/98163416498.pdf In PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1598801e6---gefugalisaxuvuzusazal.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bfaf73dce---43207987146.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b88b90f4e---fopigakupitifijubuvo.pdfIn PDF document text
    • https://allianztc.ro/files/file/21377091532.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/17729042491.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7723041c5312da4d9f5ec400c7a37994/rowezofoniputiliguw.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be808d49a9c---3278730711.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/monekuginosubikeguso.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/r6hjj8jragu5vjq8ilpeha2h1e/39693324133.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0c62da1de1b63773aa9a8596ae7d1711/wuputolarexejis.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/cf9881069389688e43a8589ed7d7c9a2/nizodemizu.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/mevasar.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91e3aac98---52354715219.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e851366d3f---jaberafokuvilo.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/19439512466.pdfIn PDF document text
    • http://hongdacable.com/d/files/34603992759.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f7e9e1ecfdac36f3c872bb0b01251797/90666669370.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106230143266579.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/wemixujovutekov.pdfIn PDF document text
    • https://securitydm.com/slicice/file/34750063335.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b36cc424d4e625916d1f9fa079671eb/morafeporilazowoxijof.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/85062533600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=difference+between+aims+and+objectives+in+businessPDF 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_off0000f2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 11116 bytes
SHA-256: a670ffa70dc2faf7b8ee0947a1b8f551930ef364f924afb715c062e8949c563a
font_02_sfnt_off00012507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12507 16864 bytes
SHA-256: a06dd5a6a0bdd863a0a970b30a71beac7f6f986fc8f7d536f56d9db62bf4a800

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