Malicious PDF — malware analysis report

Static analysis result for SHA-256 364a77abe8f6d6e3…

MALICIOUS

PDF

90.0 KB Created: 2021-07-15 09:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d8d21ff89637b6ca4a1031e7225ebcae SHA-1: 8229b346154fc734a54dac2b1365c8e3c98a7c5c SHA-256: 364a77abe8f6d6e3005ae0a3032a15635e1adedd5aed7180271bdc4601b6829d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content, likely through a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lafenicealcamo.it/userfiles/files/47624768000.pdf In PDF document text
    • https://gangnampools.com/contents//files/33206632312.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/30681638726.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c2c63faebb286c07ca25cffba7142a9b/82927217384.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/99924456573.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/misuxutegegenemamanami.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/bk10jdm3noth0af537tqnnr5o2/6301813652.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/3d69ec2086755bd8efe43faabf265beb/wapetesoxadazapute.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d5bc47abc---dofutujixinamudajux.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/165040cceb3785bcf1b18f40e3e2c04f/60633511709.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/62821231075.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086e97559b21---69456711611.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/8779154331.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/ferokinaladukalun.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/17501592716.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/kssuqmm9d7sv0glk90o1uv69g3/zekateluxuvaburazajonu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086c80893307---borafivisufibilepewefutu.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b0a199499701b1f37e189a8bdb23f665/vizexavufozuvesaxibavuv.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbec00db4e---27228110722.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/ff5232d2798e8008bb443536f45e8134/joxarenonunuw.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/pss5o7u6b8ivimtaauikp3fodv/33241940755.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/93183011381.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/j1lftltt23knrr6l0t1kqkofo4/91139721133.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/934441b39e3d960039acacb753a5b116/47355095317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+best+social+media+campaignsPDF 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_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 10964 bytes
SHA-256: 813a0c9cc9acd2c7f6bf4acb7c692db36c8aae8c864d14d28777eaa652a51542
font_01_sfnt_off0001128e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA0 18216 bytes
SHA-256: 752636a4977eda898297b9ef456f8709352efba6442a7f75033f3027db69d6f8

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